I use www.greatcollections.com sometimes. Heritage and teletrade are pretty good as well (though I have no experience with them).
I should have made my post more clear, sorry. I'm looking to buy ASE bullion from individual online not dealers.
I don't know if there is any real difference between these and eBay: http://us.ebid.net/perl/main.cgi?go=1&mo=search&category=&type=keyword&words=american+silver+eagle
This link here usually has a few coins for sale in all grades. Also a good place to get realized prices for auctions.