GoHastings.com: Buy 3 video games (possibly used only), third one shows up for $1

Ok this is my first attempt at a deal post, and I searched for it, but didn't see anything except a similar DVD deal.

I was looking through the used PS3 games on gohastings.com and added a bunch to the cart to try and use the 30% off deal (not knowing it expired yesterday) to check prices. When I checked my cart it showed 3 of the games discounted for $1 as their new cost, the others all remained the same. I messed around a little by adding and removing items, and it appears you get the lowest priced game for $1 out of every 3 you add to your cart. Not sure if it works for used games, or if there's a limit of any kind, but thought it was a good deal for some.

Let me know if there's anything I need to add or if I did something wrong for future reference. Thanks