I have been considering buying Building the perfect beast, but I was not sure If I should read chemical muscle enhancement first. I know it is the continuation of the first one, I just was not sure If I need to first one to understand the second. Also if I need both of them, does anyone know where I can get cheap or used copies at? I know nutraplanet has BTPB for 28$, but I cant find CME for under 36$. Just wondering if they have it used anywhere since I cant find it. Thanks for any help.