I know this is probably wishful thinking, but does anyone know of a place to order a new Xbox online at the usual $150 price, but with free shipping and no tax?
Try gamestop.com. You'll need to check the state(s) where they charge sales tax. I don't know what they are. I live in PA, and don't have to pay it. Also, if you use the code FREESHIPALL, you can get free shipping.
You don't even need to go to Chinatown. Just go to a small store that doesn't make too much and they likely won't charge you tax, especially if you pay by cash.