Just as they did with the Nexus S, Best Buy is offering the ultimate discount on the iPhone 3GS: Today only you can get the previous generation iPhone for $Free99.

To get the new phone, you'll have to sign up for or extend a two-year AT&T contract, but if you're in the market for an entry-level iOS device, this could be the deal for you. Hurry to your nearest Best Buy while the offer, and supplies, still last.