As one of its daily deals, Best Buy offers the Mophie Space Pack 16GB 1,700mAh External Battery Case for iPhone 5 / 5S in Black, model no. 42111BBR, or White, model no. 42112BBR, for $74.99 with free shipping. That's the lowest total price we could find by $15. It features 16GB of built-in storage, 4-LED status indicator, and microUSB cable. Deal ends today.