The short version
Only one company currently supplies this market — there is no backup if it stumbles. The price has fallen 36% in a year, to $0.2046 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.