I've been told that creatine monohydrate is manufactured by a single company, who sells it to all these different companies who then stick their labels onto the bottle for sale. They are all the same if the ingredient is just creatine monohydrate and nothing else. So the advice I was given was to buy the cheapest one you can get, as long as the company is not some shady company that sells some fake shit. Check out reviews for the companies online. I last bought creatine monohydrate for RM50 for 60 servings (300g). But I'm just a guy on the internet, don't take my words as fact.