none. because as been repeated by many members, there are NO legit sources. until an established contact surfaces up and you see multiple reports of successful transactions, you only making sure you're gonna continue to get scammed.. what convinced you you could trust the 2nd and 3rd guy after you've already been scammed once? hasn't that put you on your toes? i myself have been contacted by a few apparent sellers of N after I posted an ad looking for it, but none of the people that replied me agreed to do the transaction through a market or at least to put it in escrow some other way because guess what.. they weren't legit sellers.