You can play 25 cent Craps in Downtown Las Vegas. Many of the casinos are dropping 50 cent chips in favor of Kennedy Halves, Minnesota for example, so get them before they become obsolete. Some of the rarest chips are old 10 or 25 cents from closed casinos. It's actually not very expensive to build a good collection. Don't forget to pick up the traders.
Most people trade even up face for face, each one paying the shipping postage.
A very even deal. This might be a Grand Opening, New Years Eve, Rodeo Commemorative, Boxing Match or who knows what. The limited part varies and of course with that the availability and prices. People are selling sets, but you can still find single chips here and there, on the tables. Even chips that have been off the tables for a few years, have a way of coming back when someone who took it home for a souvenir, decides to cash it in.