As one of its daily deals, Yugster offers the Ampigo 1,700mAh External Battery Case with Speaker for Apple iPhone in Black or White for $8.97. Coupon code "FreeYugBuck" cuts it to $7.97. With $3 for shipping, that's the lowest total price we could find by a buck. It features a kickstand, 12-stage volume control, LED indicators, and purports to increase talk time up to seven hours and music playback up to 35 hours. Deal ends September 2 at 6 am ET.