Although there is no shortage of Lada Riva's in Western Europe, coming across one of these boxy sedans in the US is very rare. We found this modified example for sale on Ebay with a buy it now price that could probably get you several dozen Lada's in many other parts of the world.
Where would you find a home-built tracked Lada? Russia of course! Using potato harvester parts for tracks and steering via open differential actuated by cable-operated brakes hooked to the steering knuckles, this Lada's tankgasmic. That dangling u-joint may be problematic.