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Gaia Green broke my wallet dudes. Build a soil is the same way. A 3 lb bag of craft blend will only get through one grow cycle in a 2x4 tent. $22 for one Grow cycle and I've had a bottle of synthetic nutrients for over a year I paid 15 bucks for lol.You are right, lots of great help to be found here! It just gets tricky when you use more generic products. I started with Gaia Green, it works well but under LED definitely needs a calcium and magnesium boost. Once you go to things like chicken manure and langbeinite though I don't think I've seen anyone else here using those so it gets trickier.
My math has Gaia Green coming out at $5.50 CAD per kg (when buying the 10kg bag), my chicken manure, langbeinite, bone meal feed runs at $1.79/kg in veg and $2.51/kg for flower used at the same rate as Gaia Green. Those are prices shopping at Home Depot too, if you go to a co-op you can likely get that to less than a dollar a kg. I don't think it gets much cheaper than that although the startup costs are the same, you just get a whole lot more.
There are definitely benefits to the Gaia Green though, makes it easier to get help.
I made calculators in excel for all these which I'm happy to share but it's complex and numbers focused so it's definitely not for everyone.
I also have bulk bags of stuff like azomite and gypsum 30 lb and up, it may be more expensive up front but I think in the long run buying your own amendments and mixing your own blend will be cheaper than something like I gaia or bas.