you can easily make a pre yourself if you buy the raw materials.
citrulline 4-6 grams
betaine 1-2 grams
carnosyne 4 grams
coffeine whatever you want (not a big fan of coffeine in pres anymore, was a coffeine junkie in the past)
glycerol 1-3 grams
taurine 1-3 grams
something for focus like a nootropic
I also like vitamin C or a multi vitamin and mineral with my pre
you can also just search for the best rated pres and then search each component individually, what does it do, what dosage is recommended, the price, would you want it, etc.
etc.