Today only, with no contract required, CowBoom offers the used Apple iPhone 4 16GB for AT&T Wireless in Black, model no. MC318LL/A, for $239.99 plus $5 for shipping. That's $120 under the lowest total price we could find for a used unit, although we saw a used one for $10 less in April (since expired). Sales tax is added where applicable. It features an Apple A4 processor, 326-ppi (pixel per inch) Retina 3.5" display running at 960x640, gyroscope, front- and rear-facing cameras, 5-megapixel camera with LED flash, 720p video capture at 30 fps, 802.11n wireless networking, dual microphones, and more.

Of note, no warranty information is provided. Also, this phone does not include a USB power adapter, dock connector to USB cable, Apple earphones, SIM eject tool, or owner's manual.