I think it's funny that the PS3 versions of the used games on Gamefly are usually a few bucks cheaper, yet they usually fetch more on Amazon's trade in.
Speaking of Amazon's trade in, I love it. I did it for the first time the other day. I sent in NCAA, Madden and DMC 4 all for PS3 and got a little over $80 deposited into my account.
About the Kmart Batman deal, I still can't believe they gave a $30 coupon with that thing. Insane.