There are a lot of manufacturers from Chinese companies to domestic suppliers, I know of a domestic company that sells it for $32 a kilo but you must buy a 25 kilo drum, I just found a supplier for NMDA and I am going to stack it with Alpha GPC powder to see how it goes.
I have been using 3 grams of DAA daily and is been about 10 days and I must say this stuff works is just not so easy to measure that is why I am going to try 30mg of NMDA daily with 500mg Alpha GPC taken once daily in the morning or maybe at night.