Do what I did. Find your local coin-op company. Show up. Ask if they have anything they're willing to part out or are throwing out.
I got a Happ over under for free less the coin mechs. Only a couple chips in the paint. Some soap and water and some touch up paint and it looks like new.
Then, just buy the plastic inserts.
The trick is GO TO the coin-op company. A call may get you a name, but it's hard to say No to someone standing in front of you.... that's why door to door salesmen where invented.