I use medifast shakes (lots of vitamins) sometimes with diet soda and ice in a blender and GNC also has some good whey or soy powders that are good. Also Netrition.com also sells some good protein powders. One of my favorite brands is Champion. There are tons of protein powders and ready mix drinks. I personaly do not like EAS or Slim Fast, but I will drink them sometimes due to the convenience.