Amazon offers its Prime members the Puregear A-MAZE-ING Retro Gamer Case for Apple iPhone 5 in Blue/Red, model no. 60091PG, for $17.18 with free shipping. (Non-members must spend $25 or more to receive free shipping; otherwise it adds $5.18.) That's the lowest total price we could find by $10. It features easy-access openings for keyboard, phone features, and ports.

Although it's currently on backorder, you can still purchase it at this price, to be shipped in two to three weeks.