A friend recently sold his spare 1917 Renault to the Liberty Memorial, so there are not too many on the market, he will not put a price on the one he still has for fear of someone having the money.
Oddly enough, the laws on MGs in the US are rather illogical, for example, the Chauchat has a controlled part, it is the outer tube, because that is the part with the historical information, the inner tube and barrel and bolt are not controlled,and a person can make a single shot rifle out of them, then there is the Browning 1919A4, a parts kit can be sold and shipped with out any paper work as long as the right side plat is cut off. The only real reason for the right side plate is to keep the charging handle from falling out.