Hi guys! I'm looking to buy AC for my MBP in the next couple days, and I don't feel like dropping the $239 or whatever for it, especially with college classes coming up. But, I saw on eBay many sellers have them for sale for about $100 less. I remember reading a thread on here a long time ago about how, I guess, sellers would "deactivate" your code after it was too late to change your feedback for the seller. Thus, it looks like they're great sellers, but they're just reusing the code over and over.... or something like that. Anyway, is it safe now? Or am I still getting myself into heaps of headaches? Is there a particular seller we know is legit? Thanks!