There's a $5 chip (pictured below) from the Agua Caliente casino. Also $25 and other denominations I think.

I don't have an extra, but try Bud Myers. I saw some of these chips at his table at the last Casinorama. I don't have his email or contact info. Perhaps another reader will know how to contact him.

Also, I have seen some old postcards or photos of the casino, but don't recall who has them for sale.