check out some non-marijuana focused brands available locally...
e.g. something like Jack's Nutrients... Masterblend etc.
if you buy in bulk, you can save significant costs. e.g. i spend about per year on fertilizer. While not all grown at once, it is roughly 32 mid-sized plants per year. About per plant is fertilizer. This should show the scale of the price gouging going on with 'marijuana' focused brands.. .they are a joke... they are taking advantage of the 'community' and the vast majority of the "community" loves them for it. Bwahaha.
Fertilizer is essentially a commodity. it is ubiquitous... and with only basic quality control standards, there is no such thing is "higher quality" ammonium nitrate et al.... if it is molecularly ammonium nitrate, it will always behave the same way regardless of the brand slapped on it. Find a local farm... see if they sell a homebrew mix.. check out local nursery for same thing. get away from the assholes taking advantage in a grotesque way.
fwiw, if biobizz is a similar price point, that's awesome. like i said it is about facts, not a name. if the facts line up, it's good. 3-5 cents per gallon mixed is a good and achievable goal. dry nutes also last forever on a shelf and take up less space (compared to useless water volume and weight).