talking about pre-paid cards, not that I've used them, but maybe try checking into privacy.com, they use virtual cards, can be linked to your actual card but if you have it so it can only be used on a particular site, it can only work on that site, and I think I first about it on a show called Scam School, maybe Modern Rogue, not sure, they were a sponsor at the time
oh, and of all the gals that the MC hasn't been with yet, I'm hoping Emily is one that he will be with, just something about her, don't know what exactly