[Edit 5/12/08: This deal is dead as disco]
Purchase one of the select Xbox 360 systems (Elite or Premium) and a copy of the Xbox 360 version of Grand Theft Auto IV and you will receive $30 off your total order at check out at Amazon!
Free shipping and pay no tax in most states.
Assuming 8% tax, this can save you an additional:
Offer good while supplies last.
Check it out: Amazon - Xbox 360 Console GTA IV Deal