The FPO cards are extremely rare. And in particular the manhole card. Only 6 of them in existence! I know one seller who sold one for $9000! And there’s 2 more that have been sitting on eBay for $50 000(with a BIN however). If you want more info on their circulation I’ll post a link below. They’ve got a pretty cool story behind them too.
www.elitefourum.com/t/fpo-for-position-only-cards-official-guide/14586/1