I don't collect arcade machine (still a few arcade palace in my area to play) but I know a place where they sell refurbished arcade and pinball machine near my house
http://www.miraamusement.com/Htmls/FRmenuprincipal.html
a little expensive but I just need to get an Uhaul truck and get whatever arcade machine I want like the good old 4 player X-Men arcade, good old memories