Just give it some time. They'll come down in price a bit. Saw some in one listing for just a bit over $500 recently.
In time they'll be cheap and plentiful, just like the SR-1911's are now. When they first came out you couldn't find them for love or money. Now they're a dime a dozen. That's the way it is with most new Ruger's. It was the same deal with the Mark IV .22 pistol when they introduced it. They were hard to find, and when you did they were gone in minutes.
Once production catches up with demand, they'll be readily available, and at discounted prices. But for now they're hard to come by as demand outstrips supply. These little pistol carbines are
very popular. I've never understood why Marlin never brought back their Camp Carbines. They always sold well.