I will sell you mine for $500, would be crazy to take less!
But seriously, I got mine for $50 in fine condition. Dropped another $40 into it for parts (replaced the "rubbers", replaced the crap flipper buttons, and added a center post) and I still do not think it is worth more than $50... My kids much prefer playing the regular kids machines to the zizzle.
Oh also they are impossible to level and hitting the ramp is damn near impossible.