soil question

hey so this year im doing a gorilla grow with at least a hundred and fifty plants, they wont be all in the same spot though. I wanted 10 gallons of soil per plant and put them in grow bags but i dont have the funds for 1500 gallons of soil i was wondering if i could find a cheap way to make/mix good soil. i could ammend top soil with peat moss and rotting wood, would it be worth doing this or should i just not cheap out and come up with the money for good potting soil? should i use 5 gallons of peat moss per plant then mix it with good top soil and perlite because then it would only be half the cost? or does anyone know a place to get cheap potting soil or know a cheap way to mix my own. i was thinking about going to a gravel yard place that sells peat moss and you can get the back of your pick up filled... also will my plants need 10 gallons of soil or could i just put them in 5 gallons of really good soil and feed them nutes? i want maximum yeild per plant

that's alotta plants, hell 50 is alot. if you can't afford it, don't do it

5 gallons is plenty but the more, the merrier. farmers can sell you soil by the bedful or you can just steal it, be aware that some farmers have pitchforks!

i can afford it its just im a a cheap ass kinda id rather grow dope out of using less money then if my plants get fucked then i dont lose out on hundreds even thousands of dolllors, but yea i guess ill get enough for 5 gallons of peat moss per plant.. and maybe a couple gallons of good top soil but ill want to add perlite and other stuff does anyone know a good soil mix? like how much perlite should i add and also will i need moe addatives like vermiculite maybe worm castings??? and has anyone ever used lama shit apparantly it can be added straight to the soil no need composting but it goes kind of moldy grows white mold im guessing that would be bad and maybe cause some kind of root rot also im kind of skeptical about adding shit to soil of weed im gona smoke