I just got back from checking my local Apple stores...
I got mixed responses from reps, most interesting of them being that "we don't carry Fusion Drive models in-store". The bottom line was that all iMacs of all sizes were out of stock and that I should call back every day to check for new inventory. They even showed me on their EasyPay units.
I did notice that the "max" base model on the iPad menu was the exact model I was looking for, so I would presume that they would get those in stock in the near future. I wonder why that model isn't also a base configuration on the Apple Store site?