Meritline offers the Trident Apollo Case for iPhone 5 in Trident Green/Blue (pictured), model no. AP-IPH5-TGBLU, for $29.95. Coupon code "MLCW17TN" drops it to $12. With free shipping, that's the lowest total price we could find by $4 (outside of the price below). This polycarbonate case features an interchangeable back plate. Deal ends January 19.

A close price: SmartOverstock via Amazon has it in Pink/Purple for $8.99 plus $3.99 for shipping. Sales tax is added where applicable.