This sounds really crazy (and not quite sure if serious or not) - and I'm not saying this to offend you or anything, it's just that it won't get in my head why anyone wants to give money so that a game isn't released for pcs^^
see if it happens more times that just this one time. If yes, post a bug report to playgwent.com/support to the devs ;) Remember it's still beta release state
You can win them in the other areas: Novigrad, Velen and Skellige. I can't remember who gives you these cards but you have to follow certain questlines and have to play against some "gwent-bosses" after that you'll receive one of those special cards.