Same as @OCP2, we only own a few titles that have any real meaning to us : Tron, Pacman, Super Mario and eventually Donkey Kong is coming.. with a multicade to complete this at one point.
Those games, we found through forums on the Canadian side (MAACA and Pinball Revolution). Prices? A few classic titles do keep their value, especially if close to original, but nothing compared to pinballs. There's no fomo with arcades - so many were built! But there's also nothing to replace the feeling of the real deal, is there.
What is interesting is seeing newer arcades finding homes..