So I may be going to TN this weekend, where they are not charging sales tax this weekend (dont know why?). My question is: Should I buy online and pay sales tax (7% Indiana) or buy in store in TN (no sales tax, as far as i know). Will it affect me sending in my rebate for the ipod touch? I hear I have to send in my original receipt, which I am hesitant of. How would the rebate work if I bought it online? I am planning on buying the 2.53 15" MBP and an 8GB ipod touch Any advice?