There seems to be an extremely high percentage of casino chip collectors who don't gamble.

The easiest way to get a chip is to gamble. Go to a craps table, drop a twenty on the felt and get yourself a stack of $1 chips. During the course of play you're bound to run across several of each variety. Better yet, if the casino has a poker room, you can get a rack of chips and look through them while you're sitting at the table.