Micro Center has a $100 rebate on their console.
FYE has a $40 rebate on their console I believe, and it includes a "dual charging cradles" (I think they mean a Play & Charge Kit, but that doesn't really help with a Core unless you go wireless in the future)
Also I know Wal-Mart gives a free game (Burnout Revenge or MotoGP) with their premium console, might want to look if they do with their core's as well. I think this is a B & M deal only.
Good luck!