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It depends on what brand you want to use but, in my case, I use Advanced Nutrients. I was able to get some locally but I had to order the rest online. I ordered from American Garden Supply. A guy named Jeff is the owner and is a really nice guy. His prices were cheaper than what I paid locally and he carries the entire line. Myself and several people on IC have ordered from him with no problems and he even threw in some extra freebies with the order. I highly recommend AN and with their Nutrient Calculator on AN's website, it makes it a no brainer to use. Here's the link to American Garden Supply and also Advanced Nutrients. Good luck.