Today only, MidnightBox.com offers the refurbished Mophie Juice Pack Air Charging Case for iPhone in Black, model no. 30-1273-05-BB, for $17.95. With $3.99 for shipping, it's $2 under our September mention and the lowest total price we've ever seen for this case. (It's also a current price low by $6.) This battery pack charging case, compatible with the iPhone 3G and 3GS, provides up to 270 hours of standby time, up to 20 hours of music playback, up to 4.5 hours of talk time, and more.

Note: A 30-day warranty applies, although it's unclear who supports it.