Used YAK 52's from the 1980's that have been refurbished and overhauled (but with Russian instrumentation) and western NAVCOM and Xponder go for $60 - $70,000. The same YAK's used with a few hundred hours on them and in good shape are in the $50,000 range. The new YAK 52W (western instruments and equipment) and the new YAK 52TW (tail wheel) gor for $125,000 to $150,000.
Watch out though. These are aerobatic planes with mostly neutral stability (not hands off) and must be flown all the time. They consume 15 gph at cruise (130 - 140 mph) and 25 gph during aerobatics. It seems to be a fun and desirable airplane though and support for these in the USA is growing.
Steve
