There are large ones available here frequently but this bad boy topped the charts of anything I have seen besides in public aquariums. I will try to get more pics of other fish available here.
That guy is probably at least 10 years old, that's why you don't see them for sale very often. That guy would be a "trade in" after it had outgrown some ones tank.
Ideally you want a tank that can house 6 or more of those... and that's a serious tank. Head over to MFK for that.
You see why when people ask how many clown loaches in a 20gal.... we tell them to buy something else.