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I'm building a green house and I need some fertilizer.

I ate an extra large pizza 5 hours ago.

I'll be right over.
look on your local craigs list for ranchers/horse people offering manure by the truckload, if you are serious. Or ask at your local feed store or garden center. Not the big box one, the local Mom and Pop one. They will have a number for you
The grass is always greener over the drainfield. Just stating the obvious...
Oh yes,The grass is always greener over the septic tank. Erma Bombeck 1976. A fun read.
Build a closed-loop system. Integrate an aquarium into your indoor greenhouse.