If you're planning to buy either Halo: Reach orSuper Mario Galaxy 2 -- and it seems statistically likely that you'll want at least one of those -- then Walmart has a deal you may consider interesting. Right now, you can pre-order Halo or Galaxy and receive $20 in credit from the retailer. And, of course, since it's Walmart, the prices end in .96, saving you an additional three cents.
We don't even know when Halo: Reach will be released beyond "fall," but we already have a pretty good idea of what the best deal for it will be. Super Mario Galaxy 2 will be available May 23.