All4Cellular knocks up to 90% off select Apple iPhone 3G / 3GS Accessories. (Discount is reflected on product page.) Plus, take an extra 10% off via coupon code "POTW". That's the best discount we've seen on these accessories at All4Cellular. Shipping adds $2, or get free shipping on orders of five items or more. Offer ends May 13.

A best bet is the iFrogz Luxe Original Shell for iPhone 3G / 3GS in Blue for $2.65 after the above coupon. With $2 for shipping, that's the lowest total price we could find by $9. It features polycarbonate construction and access to all ports and sensors.