A4C offers this refurbished Dexim P-Flip Foldable 2,000mAh Solar Power Dock for iPhone, model no. EL121, for $7.95 with free shipping. That's $2 under our mention of a new unit from two weeks ago and now $6 less than the lowest total price we could find for a new one elsewhere. It purportedly adds six hours of talk time, ten hours of video, ten hours of games, or 40 hours of music. It's compatible with the iPhone 3G, 3GS, 4, and 4S.
A 90-day A4C warranty applies.