Woot offers the Mophie Juice Pack Helium 1,500mAh Charging Case for iPhone 5 / 5S in Purple, model no. JPH-IP5, for $16.99 plus $5 for shipping. That's $5 below our March mention and the lowest total price we've seen for this case. (It's a current low by $2.) This 1,500mAh battery pack provides up to six hours of talk time or up to seven hours on the Internet. Deal ends September 13.