Also be aware that most are made with collagen protein or a protein blend which people with RNY or D/S do NOT absorb well!
Even the Whey Shot is NOT the same as the Whey (or Soy) protein ISOLATE which is the (Cadillac) best and most absorbent we post ops can get. Collagen and casein blends are like putting sub-par fuel in your car.
Your basically paying 2-4$ for something you "might" only get 10 grams of protein from and that tastes like

.
If you have a band or are pre-op and can handle teh taste, go for it. You can find the Protein "Bullets" at Walmart, Costco, Target, etc. Most are pretty putrid tasting though for many folks.
I find getting an RTD (Ready to Drink) Protein shake by Muscle Milk or Pure Protein or Atkins to be a much better choice and tastes better too.
Best of luck!
Warmly,
Jackie