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Our Story
Koster's Books is a second-generation family-owned used book business. We believe a single book can be read, loved, and collected by multiple people and multiple generations. We bought and sold our first book in 1988, and after three decades, we still enjoy our role in acquiring books from one generation and finding new homes for them in the next.
Over the years, we have built a strong following of book lovers and book collectors who purchase books from us, and that demand requires us to find new inventory to meet their needs. We acquire most of our books from house calls. Multiple calls come in daily from people asking us to visit their homes and look at their books. Most of our books are purchased here on Long Island, but we have traveled from Philadelphia to Maine to buy interesting collections. Through our travels in pursuit of books, we have met some incredible people and seen some amazing book collections.
Whether you are downsizing, relocating, or dealing with an estate please contact us if you have books to sell.
Why Choose Us?
Choosing the right book buyer matters, especially when you’re selling a personal collection or managing an estate. Koster’s Collectible Books has been a trusted Long Island book-buying service for over 30 years, built on experience, integrity, and respect for every collection we evaluate.
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✔ Local Long Island Expertise
We proudly serve Nassau County and Suffolk County, with decades of experience working with Long Island collectors, families, and estates.
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✔ In-Person House Calls & Estate Visits
We make the process easy by offering house calls, in-person pickup, and estate visits across Long Island—no packing, shipping, or hassle required.
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✔ Fair & Honest Evaluations
From used books to rare and antiquarian volumes, we provide transparent, knowledgeable assessments and fair offers based on true market value.
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✔ Collections of Any Size Welcome
Whether you’re selling a few books or an entire library, we handle collections large and small with the same level of care and professionalism.
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✔ Family-Owned & Trusted for Over 30 Years
As a family business, we value relationships, reputation, and repeat clients. Our long history on Long Island speaks for itself.
If you’re looking for a reliable book buyer on Long Island, NY, contact Koster’s Collectible Books today to schedule a consultation or house call.
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Sell Us Your Books