18k for a reverse holo is nuts when all of the holos except moonbreon and gengar and even some of the crystals are way less 
I believe Fanatics just closed entries for consignment to the upcoming Premiere Auction, and that wouldâve been my suggestion.
Otherwise Z&G is a good option and will get you probably the most eyeballs internationally as well. Theyâre slow to pay out, but Fanatics is just as bad. Best of luck with either option, Iâm sure youâll get a great price 