CTCStore offers Amazon Prime members the Acase Splendid 3D TPU Case for iPhone 4 / 4S for $5.95. Coupon code "ZLLLMEBO" drops it to $3.95. With free shipping, that's $1 under our mention from last week and the lowest total price we could find. (Non-members can spend over $25 to qualify for free shipping; otherwise, shipping costs $5.40.) It features a 3D bulged square surface. Coupon expires December 31.