I have made the calculations of the chemicals according to the chemical synthesis of amphetamine documented in the following video tutorial;
http://bbzzzsvqcrqtki6umym6itiixfhni37ybtt7mkbjyxn2pgllzxf2qgyd.onion/threads/one-pot-amphetamine-synthesis-from-p2np-with-nabh4-cucl2-1kg-scale.70/
If only to obtain 1kg of speed, 2016.19 g of precursor (P2NP) are required and only 2kg of the precursor cost 570 EURO, 3474.8 g of sodium borihydride are also required, only with those two chemicals it is more than 1,000 EURO