Are you sure you aren't thinking of a different Mig?? Mig 15s go for pretty cheap, like in the $100,000 range. I heard one was for sale in Brazil for $60,000. (good luck getting it home!)
I won’t do research right now, but as I recall airworthy MiG 15 modified to be legal in the US costs much more than museum-grade technically operational unmodified MiG 15.
https://www.latimes.com/archives/la-xpm-1987-02-13-me-2216-s...
https://www.trade-a-plane.com/search?category_level1=Jets&ma...