HandHeldItems takes an extra 20% off iPhone 4 and 4S cases via coupon code "20IPHONECS". Even better, all cases come bundled with a $1 HandHeldItems Credit. With prices starting at $1.59 after coupon, that's tied with our mention from a week ago as the one of the best discounts we've seen on these items from HandHeldItems in recent months. Shipping starts at $2.85, although many items receive free shipping. Coupon expires September 30.

A best bet is this Silicone Penguin Case for Apple iPhone 4 / 4S in a variety of styles (Neon Green pictured) bundled with a $1 HandHeldItems credit for $3.65 before the above coupon, $2.91 after. With free shipping, that's the lowest total price we could find for such a case by $2.