Ashworth Books
- Features search for used, out-of-print, rare or collectible books.
- http://www.ashworthbooks.com

Glyn's Books
- Booksearch service specialising in out-of-print books on history, the sciences, the arts, natural history and other academic topics.
- http://www.glynsbooks.com/

Hooveys Books
- A service for tracing out-of-print and hard-to-find books. Old or modern, hardbacks and paperbacks.
- http://www.hooveys.co.uk/

The Big Link
- Affiliated with bookstores in USA, Canada, United Kingdom and Japan.
- http://www.booksearch.com/

Eastbay Books
- Offers to find out-of-print books offered for sale by 5500 booksellers worldwide.
- http://www.eastbaybooks.com/

Mountain Books
- Locates out-of-print, used, rare, and antiquarian books. No obligation to purchase.
- http://www.mountainviewbooks.com/

BiblioQuest
- Search with no obligation; quotes sent via email.
- http://booksearch.biblioquest.com.au/ps/search/

HP Bookfinders
- A service that specializes in the location and supply of out-of-print and hard to find publications.
- http://www.hp-bookfinders.co.uk/

Book Search at Hay
- Searches resources, both on and off the Internet, to find required books.
- http://www.booksearch-at-hay.com/