I saw that! They're out of stock at the moment and didn't have a price on it, its $250 for upper/barrel and shipping?
That's just the barrel and bolt. You would need the bolt carrier and upper but that is all standard and can be swapped out easily.
So if you get a rifle length upper in 5.56 to start on or practice with, you can swap in the 224V barrel and bolt when you are ready.