USBFever offers magnetic lenses for iPhone. Three flavors are available, the wide-angle, telephoto and the fish-eye.
The magnetic wide-angle lens for iPhone features a 0.67x wide and super macro. The telephoto lens offers 2X zoom while the fish-eye lens has a 170-degree FishEye 0.28X magnification.
All these three lenses work with iPhone 2G and iPhone 3G. Both wide-angle and telephoto are priced at $16.99 while the fish-eye costs $19.99.