On the low end, the cheapest game I've ever bought was a Williams Triple Strike I bought non working for $75.00. The playfield was dirty but no planking, very little paint loss. Cab was solid, just needed touching up. Backglass was junk.
Like so often, the nonworking part of it was frozen steppers. Cleaned it all up, ran like a top. I spent more for a repro glass than I did for the game/PBR parts order.
When I bought my Royal Guard someone had drilled four dime sized holes in the front panel I'm sure to install a bar across the front door. I took a similarly sized dowel rod and put it in the holes, glued it up, cut off either side, bondo, sanding, and done. Unless you look inside nobody is ever the wiser.
I once owned a Williams Casino woody that someone had cut a bunch of the wires in the backbox. I paid $200 for it and went through and reattached every single wire and got it going again.
How's that?