Certified Coins
Since 1979, David Lawrence Rare Coins has been specializing in buying, selling, auctioning, and consigning certified rare coins and currency. Browse over 5,000 U.S and world coins and currency today.
http://www.davidlawrence.com/

Kovels
Antiques and collectibles pricing guide. Includes info on antique repair and restoration, auctions, directory for collectors with listings on appraisal services, collecting clubs and publications.
http://www.kovels.com/

Vialin
Antiques, collectibles and fine art gallery by San Cristobal featuring society, culture and museum articles, and news RSS feed. Includes resources, directory and forum.
http://www.vialin.com/