There are two important things to remember:
You can't get the protein you want from the cheapest protein bars or the best protein bars. The best protein bars have very high levels of protein (or complete protein) for weight loss and building muscle. I have tried protein bars that have been advertised as a superfood to help you build muscle, but they are not the best. I recommend that you buy quality protein bars from the companies that make them and you can have them at home or in the gym. I have many of my own protein bars that are 100% protein, and some that are super-protein. You can always buy a quality protein bar at the store. There are many different types of protein bars out there, which means you may have a different preference. Here are my recommendations:
What does the ingredient list for a protein bar look like? I would look at the ingredients first. The protein bar should have no additives. It is important to use a low fat, whey based, non-dairy milkshake that has no added flavors, sugars, or preservatives. In my opinion, low fat is the way to go. If it has a few ingredients like stevia, honey, sugar, coconut oil, etc.