If you have a 40 head system in the flower shop you will probably want 40 count cloner ...because a pro flowers from clones right? To get a system like the Zandor's your going to spend some fat money ..but with 40 plants ..in optimum condition...your profits will pay for it in no time (unless u want to smoke all 40+ oz every 2 months) you need to get on the internet and fill a shopping cart to find out excactly what your cost will be...dont over look a carbon air /smell filter...coz that much ganja will STINK! Oh and Greg Greens book is the only book i've ever read 3 times!....what a book.!