I saw worm tea ( labeled 'worm-poo' ) in the store for the first time. I thought it was too expensive at $9 CAD approx. per 500ml (17oz).
I don't recall the brand name now.
From what I read here it seems I am right.
Maybe the worms are specially bred like Kobe(cattle) beef
Just in case a precision is required:
1 US Gallon = 3.84 litres
1 Imp. Gallon = 4.56 litres
1 Imp. Gallon = 1.20 US Gallon