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I'm always confused about the online sales tax situation, because I believe when I order something from Ritz Camera online, I don't pay sales tax, even though there's one right around the corner from my house.
 
I have bought my iMac and MBP from the Apple store. For me, I chose it because if there were any problem, I would be able to deal directly with Apple and not have to go through some middle man.
 
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