I'm not too familiar with the wolves myself, but as far as bitz sellers go, I've had good experiences with
Bitz Barn and, on Ebay,
Hoard O Bits.
Hoard has some fairly expensive buy-it-now bitz prices, but you can often win the auctions for cheaper. There are a few other big ebay bitz sellers, and the Ebay ones generally tend to be pretty safe for the buyer, especially when they have quintuple-digit feedback scores.