As one of its daily deals, and with no contract required, CowBoom offers the used Apple iPhone 4 32GB for AT&T Wireless in Black, model no. MC610LL/A, for $289.99. Coupon code "B2S10" knocks it to $279.99. With free shipping, that's tied with our mention from two weeks ago and the lowest total price we could find for a refurbished unit by $96. 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. Coupon ends July 31.

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