The short version
11 companies supply this market — deep enough that no single failure threatens the supply. The generic price has fallen 31% in a year, to $0.7197 per gram — and generics that get this cheap tend to get abandoned rather than defended. The brand (Testim) runs $3.78 per gram — 5.2× more. Put together: this looks like a healthy supply — the boring kind, which is exactly what you want.
The numbers behind every sentence are on this page below — and the Watch button emails you when any of them move.