Autographauction.Com 
Offering online auctions of celebrity autographs.
http://www.autographauction.com/Christophe Stickel Autographs
Offers auctions of historical documents, signed books, and first day covers conducted via phone and mail.
http://www.stickelautographs.com/
Alexander Autographs
Auction house for fine historical autographs and manuscripts in the United States.
http://www.alexautographs.com
UACC Auctions
Features hundreds of autographs up for auction online listed only by UACC Registered dealers.
http://www.uaccauction.com
R&R Enterprises Autograph Auctions
Monthly auctions of rare, vintage and contemporary autographs and ephemera.
http://www.rrauction.com
Fred Senese Autographs
Fred Senese Autographs has been buying and selling autographs since 1991
http://www.fredseneseautographs.com/
