If you can't find what you're looking for, I suggest you check Amazon.com where you can search a variety of used book dealers simultaneously and eBay! where you can bid on used and new out-of-print items. If all you want is a copy of a book to read, but don't need the real thing, then check out the wide selection of books available for download in .pdf format at Wizards of the Coast.
The complete campaign guide to the Forgotten Realms universe.
The Forgotten Realms campaign is the largest and most popular setting in the D&D(r) game. Everything a player needs to adventure in the Forgotten Realms can be found right here: history, maps, non-player characters, geography, economics, societies, organizations, religions, politics, monsters, magic items, spells . . . even a start-up adventure in the Realms! This book also re-integrates the Realms with the core rules of the Dungeons & Dragons game and uses the Third Edition rules to expand the Realms.
Monster Compendium: Monsters of Faerun (A D&D(r) accessory)
Approximately 100 monsters, ready to use in the Third Edition
D&D game.
Players love monsters. And perhaps that means no book will be
more popular with players than the Monster Compendium: Monsters
of Faerun. Each monster in the book-about 100 monsters in total-is
presented with a quarter-page, full-color illustration, a stat
block, and both a D&D and a Forgotten Realms(r) write-up. Every
monster in the Compendium also comes with statistics for use as
player characters.
Pool of Radiance: Attack on Myth Drannor (A Forgotten Realms Adventure)
The Pool of Radiance: Attack on Myth Drannor adventure will give
fans of the popular computer game a chance to continue their adventures
using the Dungeons & Dragons(r) game.
Take the plunge and prepare yourself for the Third Edition Dungeons
& Dragons adventure designed to take you even further into the
dangers of fabled Myth Drannor. With the fate of a city hanging
in the balance and an evil cult on the loose, there's plenty here
to occupy a party for several adventures to come.