The bulk barn where I live carries it in bulk for the cost of whole wheat flour.
I eat two or three table spoons before bed each night and while I can’t say categorically the Maca is responsible, my endurance is really good since I’ve been taking it though I take other things as well.
By the way, tribulus made me so sensitive that I wasn’t last as long as I wanted to with my wife initially, and it took some adjustment on my part not to come almost immediately the first few times.
Began December 2009 at 5 7/8" length and 5" girth.
As of December 5th 2012 7 3/8" BPEL and 6 1/8" base girth.
Going for the magic 8"x6"