FWIW, B&H Photo shows the 16gb Mini with 256, 512, 1tb and 2tb SSD in stock and ready to ship. But these all have gigabit ethernet, the 10gb ethernet models are all shown as special order.
That may have been a better way to go as they appear to do what I wish Apple did. I had a look at the site and they indicate that one-day delivery is possible. I just prefer to buy Macs at The Apple Store (the physical one or the Online Store); but I'll keep B&H in mind for future purchases. It would have been nice to have it last week when I gave up my MacBook Pro.