Target has Mass Effect for $14. Most Target stores will have the regular copies, but there's a few Platinum 2-Disc Editions with the 'Bring Down the Sky' bonus content. If Mass Effect 2's trailer got you going then picking up the first one is a good way to both refresh and used the saved data for your next playthrough.
Of course, you can buy it from Microsoft's new direct download service, but you lose out on the free DLC chapter and have to spend $6 extra. Not having a disc to get inevitably scratched up is a pretty good deal on its own, though.
