Quoted from blueberryjohnson:This any good? https://www.pinballprices.com/
Check it out. I created and run the site, it's basically the Kelley Blue Book of pinball - or as close as we can get. It does cover prices paid on Pinside plus ebay and about a dozen auction sites, some of which I pay to get their data. The ebay data is only sold price and never includes "Best Offer Accepted" because they never tell you what that is. Always open to improvement, so let me know.