The $5 Christian Book Store is back in Anderson until December 31st. Last year it was located in the Anderson Mall, but this year it is beside Mama Penn's. I went there a couple days ago and found a number of great books. They receive new shipments each week, so be sure to stop in often. Also, in addition to the $5 books, they also offer a 50% discount on Bibles and reference books such as commentaries, Bible dictionaries, etc.
Correction (10/14): It has come to my attention that this isn't the same store that was located in the mall. Sorry for the wrong information.