That stuff sounds hard to find to be honest
Looking for something like that from almost 50 years ago is going to be a lifetime battle imo
Plus since it has the nintendo brand on it, chances are it will still be highly sought after by nintendo VG collectors more or less
So not an easy thing to collect for
I am not aware of any website that deals in this but maybe try to find a retro playing cards / gambling
I know there are a lot of playing cards collectors