$50 - http://www.gnc.com/product/index.jsp?productId=3613370
Considering the active ingredient, Tribulus Aquaticus - http://ezinearticles.com/?Tribulus-Aquaticus---Is-There-Science-Behind-This-Muscle-Building-Herb?&id=4855270
And it's benifits - http://www.ehow.com/list_7196707_tribulus-aquaticus-benefits.html
You'd do better to buy a $7 can of water chest nuts b/c that's all your buying in the "Prime" anyway.
http://www.mexgrocer.com/13254.html?productid=13254&channelid=LSCAS