Source posting is against the rules - I don't do PCT because I am on TRT. In any circumstance, I personally don't recommend buying off websites, moreso for new people because it's really easy to get scammed from a website if you don't know what to look for.
It has been proven on multiple accounts and published that Nolva+Clomid is the most optimal and correct choice for PCT. I believe Dr. M Scally also has a medical journal article on it but I may be mistaken. Whenever I try to validate information, I look at real medical literature, not bro science, or heresay.
An example would be
https://www.nlm.nih.gov/
You could use powdered milk as a substitute for whey protein powder.