I just got this 13" macbook pro 2.4 ghz 4gb on june 9th w/ student discount at my local apple store. It's already opened and I am using it right now. For return/exchange, is there a stocking fee? I've been reading loads of 15" mbp users out there and for that if I feel the need to return it to get an exchange for the 15" macbook pro, just the standard one, The standard one 15" mbp, How much difference is (Money wise) between the standard 13" mbp? How much do I need to pay left if I do an exchange?