A little self-promotion here, but to check out where prices really are over the last 24 months go to www.PinballPrices.com (with a 's' - NOT the other guys that have been down for 2 years). All the sales are verified and have a direct link to that sale! eBay is about half the database of 700 sales (updated DAILY) but the other half are online and onsite auction sales that I have pulled. Prices do not reflect sales within the "pinball community" - private sales that I have no way to actually verify.
The database is powered by AirTable and searchable in desktop view, scan-able in mobile. Let me know what you think and how I can improve the site.