I am planning to buy a new iMac pretty soon and sell my circa 2005 white iMac (she'll be missed). But I was curious, I know that both the store and online charges for tax, but is the tax representable to your state's sales tax? Or is it the same tax for everyone? And do they honor student discounts online and in-store? I live in NC where there's a 7.5% sales tax if this helps. Thanks!