Hey, I'm not going to name the major retailer because they might be reading and investigate their inventory but I ordered 1 macbook air and received 2 in the mail. I checked my online order, and verified I was just charged once. Also, the two boxes had the same USP tracking number, and UPS just taped them both together as one. It's the 11 inch 128gb model. Anyhow, I googled this phenomenon and found this site. Apparently, I can keep unrequested merchandise. But, I am under moral obligation to return it. I'm so excited to now have a Mac. I was playing with my brother's Macbook Air and it was so awesome booting in to both MacOS and Windows 7 (which was super fast).