If you are really on a quest for one, you should call Ohio Ordnance works quickly and get on the list.
Forget about the US Ordnance M60, you won't find one. I am not sure why the keep that on their webpage, they have not done a production run in years. I have a friend that's been on a search for that thing forever.
Ohio Ordnance does still make their BAR, but they only tool up their machine shop for a run of receivers every couple of years.
I'm on the list for one next run, slated early next year if memory serves.
As for price, that's really not that out of line to be honest. These are an extremely low volume item and the receiver and bolt are nothing like the original, as well as a totally different operating system to comply with our friends at ATF. The machine work is first rate, absolutely beautiful fit and finish. Yet, it still manages to use genuine GI parts for everything else. Spares are easy to find except for the bolt, which I can't imagine you'd wear out anyway. It's one big honking piece of steel.
It took me close to a year just to find any for sale, when I picked up this one...