Amazon just hit us up with the knowledge that it's blowing out each and every AT&T-branded handset in its inventory for a single penny on contract, pretty impressive when you consider that you'll be paying as much as $200 for the same phones if you go through AT&T directly (and paying sales tax in the process). Of course, the iPhone is prominently missing from Amazon's inventory here, but let's be honest: if you haven't bought a 3GS at this point, you're probably planning on holding out for whatever Apple's bringing to the table this Summer anyhow. The deal's only good through April 16, so if you're planning on taking advantage, you'd better get moving.