One can find N in any English speaking country. It's very, very common. Just go to a commercial part of your region and look at signs. Sooner or latter you will find a "N". Sign printers/news-agencies/educational places may have a "N" you could buy cheaply. I suppose digital Ns are not the same for you? There a lot of Ns here in this thread. You can have mine. N. N. N.
On a more serious note, I have no idea. But, going to a foreign country and not speaking their native language seems like a very good way of being scammed. Most industrial countries should be manufacturing their own chemicals, or importing them in bulk from overseas. What is N used for commercially? Get closer to the businesses that handle it. No one cares how much BS you spew to get it. They're not going to lock you up.
Personally, I think drugs are a bad way to go.