Back when I owned an M70 these could be had in halfway decent condition for around $150.
They literally made millions of these things and yet they still sell for Stupid Money I think the biggest reason for the price of these things is that people own three or four of them which reduces the amount of them for sale which also drives up the cost to buy one Hoarders and collectors Drive these prices up beyond what they'll ever be worth in reality. These are scary box to invest in because they're always problems with these and you need very specific help to even keep these things up and running as with the M90 hardly ever has everything go wrong with it might need a good switch cleaning every now and then and some belts but that's it.