Fulton Armory's price list is a good barometer when pricing USGI M14 parts. (ie If I had to buy from Fulton Armory, how much would I have to pay?) They want $200.00 for one! That said, you can usually find USGI bbl's in the $100-150 range by looking around. A pard just got 2 from Springfield Inc for $100 ea. If I was looking for one I would be happy paying $75-100...
PS---SARCO wants $175 ea.
Also note---A few years ago I bought 4 bags of NIW TRW bolts at $10.00 per/bolt---10ea bolts per bag. Fulton wants $200 per/bolt now and SARCO has been running "want ads" for new bolts. The price of USGI parts is going up as we speak...