Well, i've brought mine a couple of months ago for about $150 and resold it a month later as i needed $$ to a fellow collector in Texas. And shipping between Canada and United States is pretty expensive (between $50 to $80).
So at $50, it's cheap (for me anyway) for a 40-years old electronic game.
And here's a picture of the solder side of the PCB (sorry, it's the only one i took before selling it):
