I'm going to buy a new MB or MBP soon. I live in Pennsylvania, where there's 6% tax, but there's an apple store close by in Delaware where there's no sales tax. I'm a student, so the amount of the discount could really make a difference. The online store gives a big discount, but when I called the physical store they didn't explain the discount very well, and it sounded significantly less. The alternative is, I suppose, shipping it to a friend who lives in DE. Would that work? Also, what sort of customization can you do in a store-bought computer? Can up upgrade to 2g memory from 1g? Can you upgrade the hard drive?