This may be a stupid question, but do they have hydro shops in South Korea? You can just walk in to a hydro shop and buy what you need without shipping. The lights, fertilizers and containes at hydro shops are used for everyday gardening. But I have never been to South Korea though.

I took my wife to the hydro shop when I got my lights, and while I was looking around deciding which to buy, another couple bought a grow set up as well. Local hydro shops make it easy cause you can pay in cash if you like. Peace