PC Micro Store offers the rooCASE Wave TPU Crystal Skin Diamond Design Case for AT&T Apple iPhone 4 in six colors (Blue pictured) for $6.95. Coupon code “IP4GSCRDIA” drops it to $2.50. With free shipping, that’s $4 off and tied with our mention from three weeks ago as the lowest total price we could find. It protects your iPhone from scratches, dust, and more. Coupon expires after 1,000 uses.