Guin, honestly I have no idea of value. I was talking to a guy in Sweden to get a special windage adjustable target sight for my favorite M96 rifle & sent him the link from Christian’s site detailing the pprj. A week later he sent me pictures of one! Totally got lucky there.
Anyways, I traded him some stuff he can’t get there for the pprj along with some very hard to find Mauser parts so an exact value is hard to pin down. I personally have been offering $100 to find another one & would probably go higher if needed. I can’t stand only having one!