As one of its daily deals, Yugster offers the iSound 16,000mAh Portable Power Max Backup Battery, model no. DGIPAD-4544, for $48.95. Coupon code "facebuck" cuts it to $47.95. With $5 for shipping, that's the lowest total price we could find by $18 and only $8 more than our spring refurb mention (this unit is new). It charges up to five USB-powered devices, including smartphones, iPad, iPod, and MP3 players. Deal ends at 6 am ET.