Four of the nine stops below sit within a half mile of each other. Boulder Bookstore holds 1107 Pearl on the mall, Beat Book Shop is a block east and one floor down at 1200, Trident, at 940, opened in June 1980 and grew into the yarn store next door a year later, and the library's own secondhand store sits four blocks south inside the Main Library on Arapahoe Avenue. The fifth Boulder address, the Bookworm, is the outlier and the one room with square footage published against it: a mile and a half northeast on 28th Street, in a strip mall rather than on a pedestrian block. After that the page leaves the city — Lafayette nine miles east, Broomfield twelve and a half southeast, Longmont fourteen north for two more — and all four of those entries open by saying which town.
Decide where you are selling before anything else, because the terms shift from door to door and cash is the rarest thing on offer. Boulder Bookstore is the exception: its used-books page can pay you in cash, by check or in store credit, keeps a buyer at the desk from ten in the morning until about six every day, and accepts as many as four boxes a household each visit. The Bookworm gives credit worth half its own asking price and reserves actual money for rare and antiquarian material; Trident buys inside a four-hour slot from Sunday to Thursday and only takes copies it grades very good or above; Barbed Wire up in Longmont pays no cash at all, but never caps the number of books you bring. The three library shops here — in Boulder, Longmont and Broomfield — run on donated stock rather than on a buy counter, which makes them scanning stops rather than selling ones.
Two Pearl Street names in the search results are corpses, and one live shop is filed under an address it left behind. Red Letter Secondhand Books traded at 1737 Pearl for 31 years and was pushed out by a redevelopment at the end of April 2021, as the Daily Camera reported on April 30 that year; Left Hand Books, the volunteer collective, closed after 34 years following the Daily Camera's January 31, 2013 notice, and its Facebook page now opens with the words that it has closed. Meanwhile the Boulder visitor bureau's listing still places Beat Book Shop at 1717 Pearl, while Downtown Boulder's directory and the bio on the shop's Instagram account agree on 1200 Pearl Street, Suite 10. One more thing to know before you plan a Front Range circuit: the closest chain counter that buys is a 2nd & Charles twenty miles south in Lakewood, and Half Price Books has no Colorado store at all.
Used bookstoresThe Bookworm
3175 28th St, Boulder, CO 80301
A strip-mall room on 28th Street that its own About page calls Boulder's largest used bookstore, at more than 5,000 square feet of secondhand stock alongside DVDs, CDs, audiobooks and greeting cards, trading since 1984. Read the terms on its FAQ page before you fill a box: you get half of whatever the store prices a book at, in credit rather than money, on up to two bags or boxes a day, handed over any time until the last half hour before closing, with cash reserved for rare and antiquarian material. Two clauses cost you if you miss them — credit that sits inactive for over a year expires, and at the register a purchase splits down the middle, half credit and half out of pocket. The shop was still posting to its Instagram account on January 29, 2026, and the one category its FAQ rules out is anything written in or highlighted, with an open invitation to bring the rest in and let them look.
Hours : Mon–Fri 10am–6pm, Sat 10am–5pm; closed SunWebsite Used bookstoresBoulder Bookstore
1107 Pearl St, Boulder, CO 80302
The large independent on the mall keeps a Recently Acquired Used Books case on its main floor and files secondhand copies through every section besides, so the used stock is easy to walk past if you only browse the front tables. Selling is a walk-in affair: the store's used-books page puts a buyer on the Used Book Desk in the children's room from about 10am to 6pm daily, offers checks, cash or store credit, and caps you at four cardboard boxes or bags per household per visit, each weighing under 30 pounds, with a state-issued photo ID required. Read the exclusions first — nothing written in or highlighted, though inscriptions are fine, no torn covers, broken spines or water damage, hardcovers only with their dust jackets, no computer books or literary journals, business and travel titles only if published within the last year — and note the sentence saying the store pays no premium at all for rare, signed or first editions. Tickets were on sale through Eventbrite for an author talk and signing here on September 3, 2026, and drop-offs after the buyer leaves go to the main registers.
Hours : Mon–Sat 10am–10pm, Sun 10am–8pmWebsite Used bookstoresTrident Booksellers & Cafe
940 Pearl St, Boulder, CO 80302
A café and bookstore trading since June 1980, employee-owned since eight longtime staff signed for it about six months into the pandemic, shelving secondhand books and secondhand records along the same wall as the new ones. The buying slot is a narrow one, so note it down: the bookstore page takes used books in very good condition or better from Sunday through Thursday between 10am and 2pm, one to two boxes or bags a day, and asks you to call for an appointment when the load runs bigger than that. Boulder Weekly published a piece on the place on August 5, 2026 that confirms both the employee ownership and the used-book buying, and repeats the daily 8am to 9pm bookstore hours the store posts itself. The house imprint, Trident Press, has been issuing punk travelogues, occult texts, weird fiction and anarchist philosophy since Peter Jones and Nathaniel K. Perkins founded it in 2017, and the store sells those titles directly.
Hours : Bookstore daily 8am–9pm; used-book buying Sun–Thu 10am–2pmWebsite Used bookstoresBeat Book Shop
1200 Pearl St, Suite 10, Boulder, CO 80302
One floor below street level at the southeast corner of Pearl and Broadway, and the hardest entry here to pin down, because the shop runs no site of its own — the website link on its directory entry points at Facebook. Downtown Boulder's business listing files it at 1200 Pearl Street, Suite 10, and describes a used book and record shop carrying used, new, rare and antique books, records, CDs, tapes, old magazines, art and posters tied to music and literature. Its Instagram account was posting on July 16, 2026, and the bio there puts the shop underground and in its 37th year. No opening grid sits above this description because nothing published by the store gives one: the profile blurb on its Yelp page says only that it opens afternoons, evenings and nights except on major holidays and dates the business to early 1990, so call 303-444-7111 first.
Library used bookstorePaper & Spine Used Bookstore
Boulder Main Library, 1001 Arapahoe Ave, Boulder, CO 80302
A volunteer-powered secondhand store the library district runs inside its Main Library on Arapahoe Avenue, stocked entirely from community donations, and nothing it publishes gives the store a grid apart from the library's. The library prints the ladder: $1 for children's paperbacks and mass-market paperbacks, $2 for every other book, 25 cents for magazines, $1 a disc for music CDs, $2 or $5 for DVD sets depending on size and $5 for an audiobook or a Great Courses set, all marked as current in July 2023 and subject to change. Two lines on that page matter to anyone reselling: the program moves part of its intake through Dream Books in Denver and recycles what is past its life, diverting roughly 70,000 pounds of material from landfill a year, so the shelf you scan has already had one pass. The same page dates three 2026 sales — April 10 to 12, August 7 to 9 and December 4 to 6 — and donations go in just inside the Arapahoe entrance whenever the library is open.
Hours : Main Library hours: Mon–Thu 9am–7pm, Fri 9am–5pm, Sat 10am–5pm, Sun noon–5pmWebsite Where can I find cheap used books in Boulder?
The library sets the floor. Paper & Spine, the volunteer store the district keeps inside its Main Library, prices children's and mass-market paperbacks at $1, every other book at $2 and magazines at 25 cents, a ladder the page stamps with a July 2023 date, and it announced three 2026 sales, the last of them running December 4 to 6. Out in the county the same money goes further still — Broomfield's Friends shop takes $2 for a hardback and $1 for a paperback through an honor box, and Lafayette's Friends put nothing above $4 on the table, with a $5 fill-a-bag session on July 19, 2026. For paid-for stock rather than donated stock, the Bookworm on 28th Street is where the volume is.
Where do I sell used books in Boulder?
Three desks on this page sit inside the city limits, and only the one on the mall pays in money. Boulder Bookstore is the one: four cartons maximum, nothing over 30 pounds, a buyer on duty from mid-morning to early evening seven days, payment in cash, by check or as credit, photo ID required, and no bonus whatsoever on scarce or autographed copies. The Bookworm converts a two-box visit into credit set at half of its own shelf price, keeping cash for antiquarian material; Trident takes very good condition or better between 10am and 2pm from Sunday to Thursday; Barbed Wire in Longmont pays trade credit only but sets no limit on quantity. The margin lives in the sorting, so take one wide shot of a full shelf, feed it to BiblioScan, and it returns a current resale figure for each spine it picks out — which is what separates the copies worth carrying to a buy desk from the boxload headed for a donation bin.
Which day is best for book hunting in Boulder?
A weekday, and preferably a morning. The Bookworm is shut on Sunday, closes at 5pm on Saturday and at 6pm on the five days between, which is the single hardest constraint on the map, while the Main Library holds Paper & Spine open to 7pm from Monday to Thursday and pulls the shutter down at 5pm on each of the last three days of the week. Downtown is more forgiving: Trident unlocks the bookstore at 8am daily and Boulder Bookstore stays open until 10pm on six nights, so the three Pearl Street stops absorb whatever time is left. Build the run as 28th Street first, then Arapahoe Avenue, then the mall, and keep Longmont for a separate afternoon since 504 Main and the library lobby are a five-minute walk apart.
When is the Friends of the Library sale in Boulder?
Boulder works differently from most American library towns, because the district runs its own secondhand operation instead of leaving it to a Friends group. Paper & Spine is that operation — a permanent volunteer-powered store inside the Main Library at 1001 Arapahoe Avenue, with no opening grid of its own beyond the library's, which labels its three 2026 dates spring, summer and winter: April 10–12, August 7–9 and December 4–6. The Boulder Library Foundation, formed in 1974, sets out its own job as raising money, raising awareness and advocating for the library; running book sales is not on that list. For a Friends event proper you drive: Longmont's next two fill the library lobby on Emery Street from the 16th to the 19th of September and the 9th to the 12th of December 2026, and Lafayette's took over its own lobby from March 13 to 22, 2026.
Are there any used book fairs in Boulder?
None that this guide could source inside the city, though one regional fair is worth the drive. RMABA ran the 42nd edition of its book and paper fair across two August days in 2026, up in Loveland, a little over thirty miles away, and charged $7 at the door; the dates and the venue are in the tips above. That is a collector market rather than a scanning one — maps, manuscripts, broadsides and photography priced by dealers who know exactly what they hold — so treat it as a day out and not as sourcing. For volume, the three library shops this guide pins and the sale weekends Boulder and Longmont have published are the better use of a Saturday.