I am going on a cruise to Mexico in April and supposedly you can get good deals on camera equipment there. Has anyone bought lenses down in Mexico? Are they a good deal? What are the chances the places are selling knockoffs and not the real thing? Good? Bad? State your experiences for me. Thanks a bunch. For the record, I have a Digital Rebel and I am considering buying one or two of the following: 28mm f/1.8, 50mm f/1.4, 85mm f/1.8, 28-135 f/3.5-5.6 IS USM, 75-300mm f/4-5.6 IS USM, and Speedlight 420EX.