Ending today at 11 am ET, Voodublu via eBay offers the factory-refurbished Belkin Grip Power 2,000mAh Battery Case for iPhone 5/5s in Blue, model no. F8W292ttC02, for $29.99 with free shipping. That's $36 under our December mention of a new one and $50 below the lowest total price we could find for a new one. It features a shock-resistant bumper, anti-glare camera ring, microUSB charging cable, and headphone adapter. A 90-day Belkin warranty applies.