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$39 + free shipping
Groupon offers the uNu Power DX Plus 2,400mAh Rechargeable Battery Case for iPhone 4 and 4S
in Black, White/Silver, or Black/Silver for $39
with free shipping
. That's the lowest total price we could find for this case in any color by $9. It purports to double an iPhone's battery life. Deal ends July 29.