I'd be interested to hear where folks buy their lenses. I have usually bought mine either from one local shop, or one major online source. The former has been okay, but they do not stock many lenses, and the latter recently did something that spoiled my faith in them by sending me a lens that was obviously used. When I notice dust inside of my lenses, I want it to be my dust. I suppose it is too much to ask for pristine, unopened lenses, but when I am handing over thousands for a lens? I want a new one.