Like the title says, does anyone know of a cheap wallet case for the iPhone 4? I've found some for $35, but that's way too expensive. I can't justify spending $35 on something that probably costs less than $3 to make, and is more of a convenience than anything. I'd like something that basically just keeps cards on the back, while leaving the screen of the phone exposed so I can use it without having to flip it open or anything. I'm ideally looking for something under $15, but I'll go all the way up to $20. THIS is a perfect example of what I'm looking for.