Groupon Goods has the eyn Storage Case for iPhone 4/4s or 5/5s or Samsung Galaxy S4 for just $17.99 right now (Reg $40). These durable cases from eyn protect against light damage without blocking any ports or features and contain a built-in storage case. The hidden panel keeps such personal items as credit cards, cash, and ID hidden. The storage compartment’s slim door can also be used as a kickstand. Shipping adds $2.99.