If you refer to the same E3ay dealer as I do ... he still has a few other useful things.
For example,
1kg of powdered Humin and Fulmin acids for only 12.90 € or a
molasses and seeweed based herbal bio-fertilizer with additional 1% Mg and 1% Ca, very useful when you have plants under LED's.
3,90€/0,5l, also available in 5l can's.