You may want to check out Amazon.com, it looks like they have a few used copies starting at $41.99. It may not be that big of a dip below $50 but it never hurts. Also, try GameFly.
RZ coupons are unfortunately specific to you, so a code can only be used once. However, there are often deals that are available to RZ members if you check out their special offers and also they end up having store-wide coupons that you can use for video games every now and then.
Yeah, I saw this too at my store in Seattle but I agree that it is not worth it for me. Gamefly seems to be the best bet if I want to rent games. Besides, game deals are plentiful and I'd rather own than rent.
I am having some issues getting into Broken Steel. I have a save before I enter the purifier but whatever decision I make, the game still ends. Anyone know what I am doing wrong?