I'm not sure but most catalog retailers will only sell the base models. I think CDW might be one of the few that will let you set up a custom order without charging you an arm and a leg. It's worth it to call and find out.
PS - I think Smalldog takes phone orders from first-time customers, don't they? Either way that rule Apple forced them to put into place is total BS. Why shouldn't anyone who wants to be able to buy first-time, online, from Small Dog? I don't get that at all.
...into the light of a dark black night.