I just ordered 10 lbs of protein blend from
www.allthewhey.com. Only cost me $45 including shipping.
its flavor is pretty mild. A very refreshing change from the GNC protein i'd been using. the GNC vanilla always had this wierd aftertaste for me.
AllTheWhey also has very cheap protein isolate, with almost 25g per scoop, but i just went with their blend instead.