Well,if you are on the hunt for a GOER,Dean's Govt surplus is about the only place that has intact units.Pretty sure Sam Winer scrapped all his some time back.BTW if you want one RUNNING one,go ahead and buy 3,cause you'll need 2 for spare parts,as NO MV parts dealers stock,or for that matter,can even get parts for these machines(believe me,I tried). They weigh in at about 15 tons empty,are overwidth,and at best,will run 30 mph top speed(if you can keep all 4 wheels on the ground).But definetly a worthwile vehicle to preserve,given their low production numbers.
BTW,I also priced tires,$2000 each for bias ply recaps.
Good luck in your search!!