I wanted to trade in my new BTO 15" 2.0 for a 15" 2.2. They did not carry the 2.2, but instead had the 2.3. The manager said they only carry the high end of each model. I guess it makes since being a retail store. However that may be just this store. I would recommend you call and ask.
I also heard that you always have to BTO HR glossy on any model. The AG they only have in stock as a high end 2.3Ghz thus you have to BTO it also on any other model (which is very advisable considering what a waste of money the highest end always is)
they have this there, or at least they have at any store i've gone to...
and, as far as HDD and RAM goes (dunno why you'd have them do it since it's cheaper if you do it yourself, but to each their own) these they don't really have to keep in stock, because if you ask for that they'll just upgrade one of the ones they have there with what you want in it.
I bought a refurb. 15"/2.2/750 for $1869. when they first appeared online, thinking it would be frequently sold out. (I also didn't wish to mess with 10.7.)