Every now and then, a member here makes a "run" of a specific part. There have been many through the years, as more discoveries have been made about the original parts.
I think there are several Russrep Obi-Wan parts in the Junkyard right now even. Serafino's "gear"/"booster" is exactly like Russreps. Most of Roman's latest parts are very accurate, but older revisions of some parts pop up in the JY now and then that are not as accurate as his later ones.
Among the older second-hand parts, I believe that a "chen" grenade is considered to be as accurate as Russrep's or at least as Roman's latest.
Then there is Obee1's emitter, whose dimensions were based only on pictures. It came right before the discovery of the real thing -- and then we saw that the dimensions were correct to within a millimeter.
Rebelscum's calculator bubbles are more accurate than any other replica.
If you are on a budget, a fair price for a second-hand Parks saber would be around $100, not more than $125.