Some of the surplus Russian NVG set ups reportedly released dangerous X ray radiation. At least that the story floating around at one point when a bunch of the surplus ones hit the market. Might want to be careful if you actually try using them.
ATN brand, newly made, Gen 1 goggles run about 270 on Ebay. Though 250 might be worth it as a militaria item if one is into tanker gear. If it is a Gen 1 set up, it's probably highly dependent on the IR illuminator, since Russian tubes weren't as good at light gathering as the early U.S. units like the Starlight scope.
If you're looking for gear to actually use extensively, you might want to try to find a PVS14 or the older PVS7. I recently obtained a PVS14 and am happy with it as a new playtoy.
Tube life on all NVG is limited. Not sure what the tube life on a Russian set is.