Ending today, HandHeldItems again takes an extra 20% off iPhone 4 / 4S cases via coupon code "20iphonecs". With prices starting at $1.59 after coupon, it's the best discount we've seen on these items from HandHeldItems in recent months. Shipping starts at $2.85, although many items receive free shipping.

A best bet is this HHI ABS Hard Case For iPhone 4 / 4s in Black for $2.72 before coupon, $2.18 after. With free shipping, that's $31 off and the lowest total price we could find. This case features a smooth rubberized coating over a hard ABS shell.