With your FedEx ID you can get up to 8% off on Apple computers and 10-15% off of other stuff but I'm almost positive you have to buy from an Apple store or on the phone from an Apple sales rep. You should just ask at an Apple store and they should know.
Oregon doesn't charge state sales tax on computers so I've known guys to pick up PDX trips to go downtown and buy an Apple laptop and not have to pay state sales tax.