Considering N is so difficult to come by, I'm not sure many people know the answer to that. Obviously there are sources (and they have their prices) but I myself wouldn't even know where to start. It seems like such a good way to go. I have a mid strength barbiturate that I get prescribed for my migraines, and it feels great! Especially when mixed with alcohol. I could only imagine how nice N must feel. Anyway I'm just rambling. If you can find a source that's fantastic! I wish you the best of luck. I know if I could get my hands on it, I would be willing to pay an exuberant amount.