Best protein powder surely??

So this is my first ever post, please be kind. I have been reading the comments for years and I have seen people post links to all sorts of protein powders. My supplement company have now got a new formula out with 45g of protein per scoop and it works out at £1.23 a scoop with the discount I get. I’m sure there’s still surely a cheaper alternative? They have the same prices for the chocolate and strawberry versions and you can get 1000g, 2000g and 3000g tubs. Any recommendations?