No idea on the value, but you already got that from others.
Spy Hunter pinball is one of the quirky games I DONT like. I don't know what it is about the game, but I just could not get into it. I normally like the off the wall designs and machines (Spectrum, Hyperball, Q-Berts Quest, etc) but for some reason Spy Hunter always left me flat.
If you love it GREAT! I hope you can find one for a good price that you will enjoy for years.
Chris