RE: cheap whey?
If you're that skint mate, I'd just rely on real food for a while.
Tuna + chicken is cheap if you get tescos value, and whey is not required.
Most high-street whey protein is very expensive, web is cheap, but you buy in bulk. At least this way you could pay 30p per tin of tuna or something, and pay as you go
Raw dead Lift 320kg
Raw bench 171kg
Shirted bench 200kg
Amateur cage fighter @ 95 - 105kg