No agent in their right mind would recommend an auction company. It would be allot like telling a qualified buyer to search out short sales... Please excuse my blunt manner because I am not here to bad mouth the process. Just know that as a retail buyer, looking to purchase a single home to be owner occupied, you should not buy a house sight un-seen or with a single weekend walk through. In other words, Putting all your eggs in one basket with out an inspection or due diligence period is not the smartest thing to do.
However, If you are an investor, looking to purchase a dozen homes in the $100,000-$300,000 price range then you can effectively hedge your bets across multiple homes. That way if you pick up one or two bad ones you are still covered.
If you want info on Auction companies - simply Googleing it is much more direct than going to Trulia and posting a question. Also look in the AJC homefinder etc.
But as you asked, I will tell you about home auction companies:
As Brokers, we get printed and email inforation from both national and local GA auctioneers when properties in all price ranges are coming up for auction. Auction companies send and email us because we are known buyer brokers.
In order to compete - you have to have cash or financing in place and auction companies require you to put up non refundable earnest money (it is returned if you are outbid - but not if you cant close in time or secure financing in time) or you arent allowed to even bid. I say all this because an auction is not neccessarily the best place to get the best deal and a lot of folks have that misconception. I have friends who are auctioneers and own auction companies and have some insight here. There are deals to be had, but you are up against the big boys on the really nice deals - investors and folks who are standing there with $500K - $1 million in Bank Cashiers Checks or sometimes even cash in a brief case. They dont have to worry about thier lender letting them down and not following through with a promised loan in 30 days, or limiting their bid to thier loan approval amount.