Yep - I'm astounded how little is around & the prices being asked for (what I think is) close to trash. Any of the cool Bally's from the 90s seem really hard to source in great shape. Economics I guess (and all the middle-agers wanting them for the man cave).
The other thing is (from my VERY limited experience) we kind of miss out on the great restorations that r done in Europe & the US (eg. beautifully restored Shadow playfields professionally sprayed with many thin coats of poly). Here it's a bit of cleaning of the metal trim with a harsh polish & a few rubbers changed & the machine is called "shopped" (whatever that means). I'm sure there are some good techs around though - you just have to know who. 
There are plenty around - you just need to look. The prices are steep, so you need to look at either buying from a collector or privately in some cases. Regarding the prices - eBay is just a shopfront for over priced machines - those prices should not be used a s guide. Sounds like you are looking for a High End or restored game rather than a container pin with a quick clean and rushed on to the floor ?
Check out the "Restorations" section of this site. you will the the differences between the eBay junk and professional work and hobbyists.
