Sources: might try SmallDog in VT - smalldog.com. Near a major metropolitian area? - try Microcenter - microcenter.com for locations.
I used to buy Mac stuff from SmallDog all the time until I found out that they were huge Dean supporters - they used to have a whole Dean page on smalldog.com, and a proud listing of how much people on staff had given to his campaign.
I won't buy from smalldog because they support Planned Parenthood and just about any other left wing cause. I prefer B&H Photo Video. They have some good prices on new Macs, and if you don't live in New York, you save the sales tax. Also, they add some pretty good stuff, since Apple won't allow discounting beyond a certain point.