I use and like the Russian turret finder; it is both nice and cheap. I like that the ares outside of the lens view is not completely blacked out but you can see outside the frame. There are FSU finders specifically for 85mm, I've not owned one but they seem to have an OK reputation.
I have also used a Canon 85mm finder that was pretty good but not likely to be cheap--the last one I noticed on ebay was about $65.
And you could consider one of the generic "tele-wide" finders; those have two frame lines I never was sure what the exact FOV was for those but I used one for my 90/4 Elmar(until I upgraded to the FSU finder and, now, the Bessa R) with OK results. No parallax correction though, just marks on the frame lines for close up. Typically very little money, I think I might've paid $10 for the one I had.
I'm sure there are other choices than just the ones I mention but these are what I've used.
Good hunting!