Paladin Books
- Used, out-of-print books and magazines; hard to find titles including men's magazines.
- http://www.paladinbooks.com

Pacific Rim Used Books
- A variety of subjects, including books about Pacific Rim nations.
- http://www.pacificrimusedbooks.com/

Phantom Books
- Used, rare and out of print books with an emphasis on the unusual.
- http://www.phantoms.com/

P. Scott Brown, Bookseller
- Bookstore with general and specialist lists.
- http://www.downtownbrown.com/

Porter's Bookstore
- Used, rare and out-of print books.
- http://www.portersbookstore.com/

Peter J. Hadley Bookseller
- Rare and academic books, catalogued by subject and author.
- http://www.hadley.co.uk/

Puppet Press
- Original eBooks, rare and used books.
- http://www.puppetpress.com/

Pistil Books
- Offering various categories of used and out-of-print books, blank books, and journals. Also offers book searches.
- http://pistilbooks.net/

Pinacle Books
- Antique books for sale, sorted by category.
- http://www.pinaclebooks.com/

Paperbacks.com
- Specializing in a variety of used titles.
- http://www.paperbacks.com/

Peter Grosell Antiquarian Bookseller
- Old and rare books. Site in English and Danish; many books listed only in Danish.
- http://www.grosell.dk/

Payson Hall Books
- Out-of-print, rare and antiquarian books; strengths in the books about Ireland and the Irish, America (especially New England), Architecture and Art.
- http://www.oldbooks.com/

Princeton Antiques Bookservice
- Literary procurement and research specialists for rare, antique and out of print books.
- http://www.princetonantiques.com/

Pageant Book and Print Shop
- Used and rare books.
- http://www.pageantbooks.com/

Papermill Books
- We specialize in quality used and hard-to-find books, primarily non-fiction for adults and children.
- http://www.papermillbooks.com/

Pecan Tree Books
- Rare and antique books; childrens books, first editions, signed and out of print books.
- http://www.pecantreebooks.com/

Pioneer Books
- Antiquarian and secondhand books including modern first editions, children's, ephemera, Victoriana, Australiana, sports, music, maritime, military, art and Asia.
- http://www.pioneerbooks.com.au/

The Philadelphia Print Shop
- Atlases, geographies, Americana, color plate books, illustrated travels, gift books, histories, and other rare books from the sixteenth through the nineteenth century.
- http://www.philaprintshop.com/rarebook.html

Published Page
- Searchable used and rare bookstore, also offers book locater service for titles not in stock.
- http://www.publishedpage.com/

Plaza Books
- First editions, literature, history, Western Americana, wine and food books, and general stock.
- http://www.plazabooks.com/

Peter Harrington
- Travel and voyages, natural history, children's books, fine bindings. Based in London UK.
- http://www.peter-harrington-books.com/

Pellbooks
- Hard-to-find books with an emphasis on German and Austrian literature. Over 6000 titles in 35 different catalogs.
- http://www.pellbooks.com/

Palette and Print
- Offering vintage, used and rare books.
- http://www.paletteandprint.net/index2.html

Philadelphia Rare Books and Manuscripts
- Early Printed Books, Substantive Manuscripts, U.S. and Latin Americana, Hispanica, Histories and the History of Ideas, Travels, Law, Religion, and Bibles (all prior to 1820).
- http://www.prbm.com/

Powell's Books
- New, used, and out of print books; many categories with detailed descriptions and illustration of selected books.
- http://www.powells.com/

Pages Past
- Collection of old, used, and rare books listed by subject.
- http://www.pagespast.com/