Other World Computing offers the HeadCase Bottle Opener Case for iPhone 4 and 4S, model no. DM01-4-B, for $7 plus $1.75 for shipping. That's tied with our mention from last week as the lowest total price we could find by $4. This plastic case features a stainless steel bottle opener and can tab opener and works with a free app that counts the tops and cans popped.