Yes, you can get protein powder from the supermarket.
For the better stuff like Musashi, it is well overpriced, and still low quality.
Then there is the real cheap shit, cheap for a good reason.
Might as well use milk powder to bump up your protein, that's cheap.
How can you not trust internet sellers !!!
Most online sellers actually have physical stores and outlets, phone numbers, etc.
You can order over the phone with them if you are feeling insecure.
Try proteindirect.com.au