Hi Paul.
Price of the army surplus T-34 here in Czech Republic increased 5 times since 1990, price of the BMP-1 roughly three times and will be worse. By my meaning, time for the investment in something rare like special Czechoslovak BPzV "SVATAVA" reconnaissance vehicle, based on the BMP-1 when not many of them were manufactured, shortens very quickly. What more, there is a continuous demand for spares from countries like Yemen or Mongolia, where there is no ban for export to these countries and profit from the vehicle parted out for spares, especially weapons is 5 times higher than from something sold on as it were and where it were basis. So, the official policy of the private companies licenced for military export of the army surplus is to dismantle a vehicle, sell the gun, engine, tracks and wheels and scrap all the remains. I'd guess situation in Hungary or Poland would be the same. Sooner or later you'll end up trying to import hardware directly from Russia, where wear-up is much worse, not to mention transportation costs.
Regards Robert