Here's a list of the sites that I've found of interest. The Stein Auction is a great place to visit but you must be able to excercise restraint because it's easy to get caught up in the bidding. Most are gift shops (read list price) but others such as Sam's offer discounts and he's an authorized Anheuser-Busch Stein Club dealer.

If you know of others, let me know and I'll add them to the list.