A good smith or machinist can install the .308 barrel for half of that, depending on how hungry he is and whether headspace issues arise. I do my own barreling now. (And no, don't ask! I don't have an FFL.)
Sure, that's just for labor, but you still have to buy a barrel.
JES is a good deal, for a moderately good product. If you can buy a good brand new barrel for $200, and find someone to chamber and mount it for $200, You'd have yourself a great deal, and an accurate shooter.
I can't see going to the trouble of trying to save money just to end up with a mediocre shooter.
