I personally use a base nute 2 part formula NPK 6-3-8 from start to finish.
With extra Ca, Mg, Si and PK1314.
My whole nutrient lineup costs me £53 around $75.
These are all one litre bottles.
The base nute lasts me 2 harvests of 4 plants.
The other additives so far have lasted me over 12months.
I do use some other extras such as a root stimulator and an enzyme product. But these aren't really any extra nutrients. Very minimal NPK on the root stimulator.
Day 41 of 12/12.
I grow in coco with chemical nutes and don't flush.
My plants at harvest time are as green as you see them in the pics above.
J