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May I recommend Amazon? (Purchases made through that link will result in a contribution to this blog, with no difference in the price you pay. Thanks for showing your appreciation that way. Believe me, I notice and am encouraged.)

ADDED: May I recommend this lens kit for iPhone 4 (and some other phones) and iPad? Wide angle, micro, and fisheye! You know my obsession with fisheye! I use this lens, which I highly recommend if you have a Nikon SLR camera. I prefer the big, harder-to-steal camera for an urban environment.