Hot on the heels of Walmart's very sweet deal on Halo: Reach, Amazon has gone ahead and matched it, offering patrons of the pre-order arts a $20 gift card to sign up for Bungie's latest. Based on some very high-brow mathematical calculations, we've deduced that the gift card is actually a 47 percent savings on the title's $59.99 price tag -- a damn decent deal, to be frank.

... what? Oh, you think our math is off? What, did you go to some math college or something? You did? Well, uh, we're ... uh -- look, jet packs!

[Via Slick Deals]

This article was originally published on Joystiq.