Biddington's
http://www.biddingtons.com

Ebay
http://www.ebay.com
Ebay is the world's most recognized online auction.

Great Gatsby's
http://www.gatsbys.com
This Atlanta-based auction house has online auctions through ebay's Collections pages.

icollector
http://www.icollector.com
Online auctions, catalogs, reference articles, research guides, and experts make icollector a successful virtual community.

TIAS
http://www.tias.com

Yahoo! Auctions
http://auctions.yahoo.com

411 Antiques
http://www.411antiques.com
This site includes online auctions, resources, search engines, gallery and museum listings, and classifieds.