Finding Rare Books at Library Book Sales — A Scouting Guide
Library book sales — organized by Friends of the Library groups, library foundations, or the libraries themselves — remain one of the most productive hunting grounds for book scouts and collectors. While the days of routinely finding $10,000 books for a dollar are largely over (thanks to smartphone scanning and increased awareness), knowledgeable collectors who understand what to look for still make significant finds at library sales.
Types of Library Sales
Annual Book Sales
The most common format. A Friends of the Library group collects donated and deaccessioned books throughout the year and holds one or two large sales, typically lasting a weekend or longer. These can range from modest affairs with a few hundred books to massive events with tens of thousands of volumes.
Best-known large sales:
The Brandeis Book Sale (Waltham, Massachusetts) is one of the largest annual book sales in the United States, offering hundreds of thousands of volumes.
The San Francisco Public Library Big Book Sale draws thousands of buyers over multiple days.
Johns Hopkins University and many other universities hold annual sales of deaccessioned library material and donations.
Ongoing Sales
Some libraries maintain a permanent book sale area — a shelf, a room, or even a dedicated shop — where donated and deaccessioned books are continuously available. These require regular visits to catch new additions.
Bag Sales and Dollar Days
Many library sales end with a final day where remaining books are sold for a flat price per bag or per item (often $1–$5 per bag). While the best material has been picked over by this point, bargains remain for knowledgeable buyers.
Online Library Sales
Some larger library systems and Friends groups sell books online through platforms like Better World Books, ThriftBooks, or their own websites. Online library sales are less likely to yield overlooked rarities because the books are typically screened before listing.
What to Look For
Deaccessioned Library Books
Libraries periodically remove books from their collections through a formal process called deaccessioning. Deaccessioned books are stamped “WITHDRAWN” or “DISCARDED” and offered for sale. While ex-library condition reduces value, some deaccessioned books are genuinely rare:
First editions that entered the collection when new. A library that purchased a first edition of a now-valuable book in 1960 may deaccession it in 2025, offering you a first printing at sale prices.
Specialized reference works. Academic libraries deaccession reference works that are valuable to collectors and dealers — bibliographies, exhibition catalogs, scholarly monographs.
Local history and regional press items. Small press publications, regional history, and local imprints that are genuinely scarce.
Donated Books
The bulk of library sale inventory comes from donations — personal libraries, estate donations, and corporate library disposals. Donated books are more likely to be in collector-worthy condition because they have not been subjected to library processing (stamps, labels, card pockets).
Estate donations are the richest source. When a serious collector’s library is donated to a library sale, the books may include first editions, signed copies, and scarce material that the library volunteers did not recognize as valuable.
What to Prioritize
Signed books. Check the title page and front endpapers of every book that interests you. Signatures are invisible in a stack and easily overlooked by volunteers pricing books at $2.
Dust jackets on older books. Pre-1970 books in dust jackets are inherently more valuable than unjacketed copies. If you see a 1950s novel in its jacket, pull it.
Small press and limited editions. These are frequently unrecognized by volunteers and priced as regular books.
Genre fiction first editions. Science fiction, mystery, and horror first editions from the 1950s–1980s are often overlooked because they look like ordinary paperbacks or cheap hardcovers.
Children’s books in good condition. Early editions of now-classic children’s books in dust jackets are worth checking carefully.
Scouting Strategies
Arrive Early
For competitive sales, arrival time matters. Many sales offer “early bird” admission for a premium ($10–$25), allowing paying attendees to enter an hour before the general public. For serious scouting, the early bird fee is almost always worthwhile.
Know Your Categories
Decide in advance what you are looking for and head directly to those sections. If you collect modern literary fiction, go to the fiction section first. If you specialize in art books, head to art. Do not wander — at a large sale, you cannot examine everything.
Develop Recognition Skills
The most productive scouts can identify potentially valuable books at a glance — by spine design, publisher, series, dust jacket style, or author name. This recognition develops with experience and cannot be replaced by scanning.
Use Your Phone Wisely
Smartphone scanning apps (checking prices on AbeBooks, Amazon, or eBay) are now standard tools at library sales. However:
Do not scan everything. Scanning every book is slow and conspicuous. Use scanning to confirm values on books you have already identified as potentially interesting through visual inspection.
Check completed sales, not asking prices. A book listed at $500 on AbeBooks may never actually sell at that price. Check sold listings on eBay or recent auction results for realistic market data.
Be discreet. Some library sales prohibit or restrict electronic scanning. Respect the rules.
Build Relationships
Befriend the Friends of the Library volunteers. They often have knowledge of upcoming donations and can alert you to particularly interesting material. Be polite, be a regular, and be generous — these are volunteers working for a cause.
Pricing and Ethics
Fair Pricing
Library sale pricing is typically far below market value — that is the nature of the venue. You are not obligated to inform the library that a book they priced at $2 is worth $200. The books are priced to sell, and the proceeds benefit the library.
However, most scouts follow informal ethical guidelines:
Do not misrepresent yourself. If asked whether you are a dealer, be honest.
Do not damage books or conceal items. Some unethical scouts hide books around the sale venue to reduce competition. This is dishonest and harmful.
Give back. If you profit regularly from a library’s sales, consider making a donation to the Friends group.
Realistic Expectations
Library sale scouting is a numbers game. Most visits will yield nothing of significant value. Occasional visits will produce one or two modest finds. Truly significant discoveries are rare — perhaps a few per year for an active scout. The enjoyment is in the hunt, and the finds are a bonus.
After the Sale
Processing Your Finds
When you get home from a library sale:
Examine each book carefully. Check for completeness (all pages present), condition issues (water damage, foxing, stains), and edition/printing status.
Research values. For books you suspect are valuable, check current market comparables on AbeBooks, Biblio, and completed eBay listings.
Remove price stickers carefully. Library sale price stickers can damage dust jackets if removed carelessly. Use a hair dryer on low heat to warm the adhesive before slowly peeling.
Clean gently. Light surface dirt can be removed with a soft, dry cloth. Do not use water or cleaning products on valuable books without understanding the risks.
Selling Your Finds
Library sale finds can be sold through multiple channels depending on their value:
High-value finds ($500+): Sell through a dealer, consign to auction, or list on AbeBooks/Biblio with detailed descriptions and photographs.
Mid-value finds ($50–$500): List on eBay with good photographs and accurate descriptions. ABE/Biblio listings also work but may take longer to sell.
Low-value finds ($10–$50): Batch list on eBay or sell through a local used bookshop. The time spent listing books individually should be proportional to their value.