Annoyed with Apple today, I called the Apple store because I wanted to see if they had a Macbook Air with 8GB RAM in the store to purchase (MBP died on the weekend), and they assured me that I would be fine, so I drove all the way in, and of course they don't stock them (no one does, you have to order them online apparently).
I guess I'll wait until an 8GB one shows up in the refurb store.