Nickerson

Well the certainly have a unique selection. Famous has quite a few good exclusives and cigars others doesn't carry. CI has quite a bit of exclusives as well.

CigarBid got the most attention. Lately its only been worth while to do a quick buy price on the item, as the final bidding price usually exceeds the quick buy. People are starting to over pay.

I like CigarAuctioneer. Not many have seem to "discovered" it yet, so you can get some great deals.