We have featured a few nice iPhone wallets that can hold your cards for quick access. But if you also need portability, the following Precision Pocket card holder for iPhone 4 and 4S may be more suitable for you.
The Precision Pocket is a unique card holder that measures 6.6mm thick at widest point. As we can see from the images, the card holder features sleek, ultra slim design, and is made out of premium locally sourced rosewood exterior and the finest Italian made Alcantara suede endoskeleton, and the inner room is designed to hold up to 3 cards, moreover, the thumb port allows you to take the cards out with ease, while the patent pending internal flat spring card lock mechanism keeps your cards securely in place. Apart from that, the iPhone camera is accessible via custom opening.
Precision Pocket card holder is priced at $89 USD. If you’re interested, jump to Killspencer for more details.
Additionally, if you need other options, you might like to check NUU ClickMate PowerPlus iPhone 4 case and Tangram Smart iPhone 4 case