Alibris	http://www.alibris.com/	Used Books
AbeBooks	http://www.abebooks.com/	Used Books
Antheil Booksellers	http://www.biblio.com/bookstores/AntheilBooksellers.html	Used Books
Christian Schmidt Fachbuchhandlung	http://www.christian-schmidt.com/	New--Used Books
Edward Hamilton	http://www.edwardrhamilton.com/	Publishers Overstocks
Edward Hamilton (Naval History)	http://www.edwardrhamilton.com/subject2/nww.html	Publishers Overstocks
Ebay	http://shop.ebay.com/ebayadvsearch/	New--Used Books
Scholars Bookshelf	http://www.scholarsbookshelf.com/default.asp?userid=	Publishers Overstocks
Aberdeen Bookstore	http://www.aberdeenbookstore.com/	New Books
Military Press	http://www.militarypress.co.uk/	New Books
Half Price Books	http://www.halfpricebooks.com/	Used Books

Note:  I have purchased books from all the above listed sources and from past experience, they are all reputable dealers.

"Politicians are like diapers..they should be changed frequently and for the same reason"--Will Rogers