Optimum's BCAA 5000 powder is the cheapest 2:1:1 BCAA powder from any of the *major* brands. I see it for 6.82g Leucine per dollar.
But what is the leucine:isoleucine:valine distribution of JAM's? Is it 2:1:1 or 4:1:1 or similar?
If it is 2:1:1, then you'll get 8.08g Leucine per dollar - a great deal!!
But he did ask for best, not cheapest. That's why I said Xtend ;-)