As you know Ebay is full of rare coins but it is easy to miss them in the huge offer of this website.
I have created an automatic tool to rank and filter Ebay coin auctions. It enables me to easy find rarely offered coins.
It may interest you, see here : www.coin-secret.com/index.php/top-coin-auctions
There are filters to find the top coin auctions, to find US coins, ancient coins, and so on
Hope you will like it.