Where to buy single fertilizers like Calcium Nitrate, Copper Sulfate and etc??

I want to buy single fertilizers in person (not online) and I am in the San Fernando Valley, California or near Los Angeles.. Where do you find single fertilizers from? Calcium Nitrate, Mono Potassium Phosphate and the trace elements.. I thought feed stores, I searched online and etc but very hard to search for.

did you ever get an answer to this??

Hydro-gardens.com

Marisol Martin said:

did you ever get an answer to this??

Click to expand...

eBay
customhydronutrients.com
kelp4less
crop king
I'm sure there's lots more.