Wow Scott,

That is a rare title, not just here in Australia either.

You need to ask him questions to fish for a price. What I usually do is ask them for a ballpark price so you have 'some idea on how much money you need to bring'. Another question is ask them (nicely  ) how much they payed for it, that will give you some idea on what they may expect. If they turn around and say $500, then say 'would you take what you originally payed for the game'

Also the longer you can keep them talking the more of an idea you will get for what kind of price they are expecting.

It's a game and the more you play the more you master the art of 'weasling that game from the owner for a cheap price' 

The only problem is, if you hear the word 'eBay' you are screwed.

Ten years ago I would of offered $100  but these days would start at $500 and go from there. Wouldn't go higher than $700 though especially as you say the backglass is flakey.

This is a very cool game and wish you well with the purchase. Keep us all updated and post pics if you do score it.

Every collection needs at least one nice EM and this would be the perfect start (even though it's not a Gottlieb )