I have 23,000 in stock, but everyone is 18.38" high. They were surplus from a military contract. Oh, and everyone is magenta.
If you did not need a huge number of them you could stack a pile of coro together (any colors with some 2 sided tape) and cut with a band saw and do 10 or more at a time. I would think a pile 6 inches or so high should cut ok without the blade wanting to wander. Depeding on the thickness of the blade.
I know there is a circle designer out there....... you can see if he does stars....... if you get the template get me one.....