There are tons of different types of protein powders on the market as you know. I typically recommend plant based proteins over the other options in most situations. Many of these brands provide flavor options, but for breakfast smoothies, I typically like to stay with chocolate or vanilla. Of course you can choose other options if you prefer. Aside from the priority being a healthy shake with as little sugar as possible (without artificial sweeteners), it must be enjoyable or else you just won't drink it!
All of the protein powders I am suggesting taste great, especially when blended properly and mixed with the right combination of fruit and vegetables. Do not just compare prices between the protein options, also look at the ingredients and see which would compliment your current diet the most. Also, each manufacturer has a different amount of servings per container. For example, one product may cost half as much as another, but that may because there are half as many servings per container.
My favorite protein powder with the best value is Sunwarrior. You can choose from a bunch of flavors and sizes and their products are organic. Visit their website and get 10% by clicking one of the images below. (If the discount is not applied when the product is added to your cart, add DREAM where it asks for a discount code).