The 25 is listed, but description is incomplete. This is one of those situations where it matters whether you count "inserts" or "edge spots"; there are three sets of 2 inserts that wrap around the edge to the rim. There are also six more yellow edge spots, making a total of 12.

I have the 25 turtle chip for trade, or for sale at $35, delivered. The room key is also for trade for slot cards I don't have.

Note: TCR lists the 25 chip as a "C" value (V4813), but both it and the 100 are playable until lost, so should be rated close to the value of a live chip.