I just discovered Hoard o' Bits myself. They have a great selection, but I wish they would put their bitz in categories a little narrower than just what army they are from. 1000+ auctions is allot to search through when you're looking for a specific piece. BlackDagger puts everything in categories though, so that's another thing I like about them.
I've found another ebay store called Battlefront Games, which has a great selection of IG and SM bits. I haven't seriously compared prices on these three stores yet, but if your looking for some particular bitz chances are at least one of these places will have them.
And wow big_d... Just wow... $11 for a full tactical squad with a captain? I think your find takes the cheap bit crown.
Oh, and here's some links if anyone's interested:
http://stores.ebay.com/Blackdagger-Games?_rdc=1
http://stores.ebay.com/Hoard-O-Bits?_rdc=1
http://stores.ebay.com/Battlefront-Games?_rdc=1