Instar,
You're right, true, cold extracted Ecdysterone at least 5-15% is the BOMB. There is no other OTC product that works like it. Ecdysterone is the only OTC anabolic steroid on the market in the US. It works by increasing ribosome count, nitrogen retention, and protein synthesis in muscle tissue.
Take high enough doses, and even dose it transdermally with plogel, and you will have results. Normal oral dosing however will be a little less powerful than taking anavar.
Like you said, it's a great anabolic to use after a test cycle.
As far as finding a company that properly extracts it in then United States, a friend of mine who is a chemist well aquainted with the supplement companies says EAS has the right equipment to do it, and they do put Ecdysterone in their "Methoxy(something or another)" as a main ingredient. This product is the best bet I know of, if you are in thhe US and want true Ecdysterone.