Kay's Technology via Amazon discounts a selection of KaysCase iPhone 5/5s cases to 1 cent. They're some of the least expensive iPhone 5 cases that we've seen. Shipping adds $2.98.

A best bet is the KaysCase Flipper Leather Cover Case for Apple iPhone 5/5s in seven colors (Black pictured) for 1 cent plus $2.98 for shipping. That's $26 off list and the lowest total price we could find. It features a flip cover.