Wondering if anyone has any experience on ordering vs. buying from a "brick and mortar" store. I'm looking to buy a new G5 iMac, and was planning on ordering from apple.com, but was surprised to find out that they were charging me tax! In your experience, are there any online retailers that offer rebates (amazon.com has $150 off of the iMac right now) or other incentives, including free shipping and no taxes? Any advice would be greatly appreciated- Help a potential switcher make the switch!