The patented Lightning Bingo games use chips, Larry. I know they are currently used in Washington, and believe also in Florida and several states in the midwest. Don't know whether the California bingo hall had this game though.

I'm also told the elusive 50c pink hotstamp chip from the Reno Flamingo Hilton was only used in the funny bingo game they ran for a while upstairs. They are not curently used and unavailable from the casino cage.