I currently use Egg Protein by ON but was looking into gaining weight.
Does anyone know why the pro Complex gainer is so much cheaper than the Pro complex itself?

http://www.optimumnutrition.com/products/pro-complex-p-205.html (Link for Pro complex)


http://www.optimumnutrition.com/products/pro-complex-gainer-p-207.html (Link for Gainer)