A friend of mine - wine maker - here in Spain, brought his own garum recipe to market a few years ago [1]. He's is having tremendous success selling to restaurants.
[1] https://www.abuelaconcha.com/tienda/salsa-flor-garum-100ml/
[1] https://www.abuelaconcha.com/tienda/salsa-flor-garum-100ml/
I mean I get the point, but a bottle like this can last you months, it's not exactly bank breaking.