I'd pay full price if had to. 60$ is deff worth it for this product. Its pretty concentrated and has a great shelf life. Don't buy online, support a local shop!
Hydro version: $25 per 16oz and free shipping when over $150
I got 7 (16 oz hydro versions ) of them and that makes me very close to a gal for 157 bucks
https://www.monstergardens.com/Primordial-Solutions-Sea-Green-HYDRO?search=Sea green&category_id=0