As one of its daily deals, and with no contract required, CowBoom offers the used Apple iPhone 4 16GB for AT&T Wireless in Black, model no. MC608LL/A, for $229.99 plus $5 for shipping. That's $10 under our mention of a used unit from five weeks ago and the lowest total price we could find for a used unit today by $193. 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. Deal ends today.

Note that no warranty information is provided. Also, these used items may have blemishes and be missing accessories.