The short version
Just 2 companies supply this market — thin enough that a single exit would be felt immediately. The price has fallen 78% in a year, to $0.6606 per unit — and generics that get this cheap tend to get abandoned rather than defended. Put together: worth watching — several of the pressures that precede supply trouble are present at once.
The numbers behind every sentence are on this page below — and the Watch button emails you when any of them move.