Now for something everyone can appreciate, and the case I've been using with my Galaxy S7 Edge. Simple and cheap TPU cases are often the best route. They're flexible plastic that are durable, impact-resistant, and very cheap to manufacturer and sell. In fact, the EasyACC or Tuari Galaxy S7 TPU cases are less than $8, and will protect the phone very well.
EasyAcc has a nice TPU Galaxy S7 Edge case with raised and rounded edges to keep the phone safe if dropped, while still dipping down allowing for full access to the slide-out bar on the "Edge" and all ports underneath. It's the perfect cheap case that will get the job done, and be more slim than any other case available on the market. It might not add anything like our previous cases, but it's more than enough for most.