1) register master card program 20 off 200 here: Last few day to do it!
2) buy xbox 360 4G bundle with kenect for 299.99 with 100 Amazon credit (MAKE SURE IT's SOLD by AMAZON)
3) use master card to check out for $10 discount with code 3TLRXE3N today only!
Detailed Link from Amazon need to select master card to check out payment to have this code working!
4) pay for 290. get back $20 in master card gift card and $100 amazon credit.
Final price 290-120=$170!!!