Yep you just found it, I made about 10 Gallons of this (bottled 36Liters) for 45$ (ingredients only).
But it includes that I used 16 pounds of Pale 2-row (worth 48$ for a 25Kg bag), 2,2 pounds of flaked corn (worth 8$) and 2,2 pounds of minute rice (worth 7$).
I could have used half of...