I've gotten non-authentic coils with clone minipro tanks from FT. They were no better or worse than the authentic. I bought some coils that did not claim to be authentic, but were, only in scuffed and dented boxes. I haven't bought GS coils from them, so I can't say much there. Sweet-vapes has them in stock at $9.50 for 5 pack. That's where I got mine.