Ebay
http://www.ebay.com
Online marketplace for trading widely varied categories of goods.
GoAntiques
http://www.goantiques.com
Trades antiques, fine art, and collectibles from a base of 1800 dealers and auction houses. Includes a catalog archive
Icollector
http://www.icollector.com
Trades art, antiques, and collectibles auctions worldwide. Includes auction house catalogs and prices previously realized at auctions from the past ten years.
