Cheap Protein Powder that I Really Like

This post is not sponsored!  I just really love "Bob's Red Mill" protein powder.  It's the cheapest protein powder that I've found, and I like that it's simple (the only ingredient is soy protein).  There's no sweetener, so it's low in calories.  

The cheapest source of this protein powder that I know of is iherb.com.  A 14-oz bag, which contains 20 servings, is $7.99.  That works out to be $0.40/serving.  For protein powder, that is really good!

My favorite thing to make with protein powder is a banana cacao milkshake.