I make my own so I can control what goes in it as well as its cheap as shit.
2.5 grams - Beta Alanine
5 grams - Creatine Monohydrate (Flavoured like peach and mango so the whole thing tastes nice)
8 grams - Citrulline Malate
2 grams - Acetyl L Carnitine
200mg - Caffeine pill
Can take more caffeine if you want to do a big lift that day but this is pretty strong on its own and works well.
Flavour is like strong peach and mango lucozade that is a bit sour. 8/10 taste.
Mix with like 300-500 ml of water and is good.
I haven’t done the math overall but its work out to be under £1 per serving.
I don’t know if I can say where I buy the bags of seperated ingredients.