Froogle:
Developed by Google, Inc. One of the most promising price comparison sites to date.
BizRate:
One of the largest price search sites. Over 30 million products listed.
Shopping.com:
Child of Dealtime and Epinions, now merged to provide you with three shopping search engines that feature your products separately, yet the same.
Yahoo Shopping:
Complete Yahoo Shopping data feed creation and maintenance solutions.
MSN Shopping:
Complete MSN Shopping data feed creation and maintenance solutions.
NexTag Shopping:
Complete NexTag data feed creation and maintenance solutions.
PriceGrabber Shopping:
Complete PriceGrabber data feed creation and maintenance solutions.
Cpin Auction DK
This site is in Danish and some English offering auctions on mostly Danish coins.
Heritage Rare Coins
Public auction sales of high quality rare coins, currency, signature sales and bullet sales.
CoinPages.com
Coin auction and coin classifieds for coins only.
Bowers and Merena Galleries
Rare coin dealer and auction house, providing rare coins to collectors, dealers, and museums across the world.
CNG Auctions
Conducts auctions of World, Classical, Medieval & British Numismatics Since 1975.
Rauch Auctions
H. D. Rauch GmbH, Vienna, Austria. Auctions and online shop. Coins, stamps, decorations, and medals.