If you live in the Bay Area, check out the Pacific Pinball Museum (aka Lucky Ju Ju) in Alameda. Flat admission fee and all pinball games are free play.
I happened to visit as they finished setting up their Tron LE back when that came out, and immediately fell in love. That machine -- especially the LE edition with the light-up "lightcycle" ramps, and the Daft Punk at full volume -- is my holy grail of material possessions. I'll know I've made it when I can buy one of my own.