I intend to have a special print of each card that's for a specific person which those people will be able to keep. I don't think I'll be able to make foils, but maybe something comparable?
MEGAIDEA
So, how about if I bring two full sets of these and 10 or so gold-coloured gel pens, and we have everyone sign their cards. Everybody keeps one, then we offer the other full signed set for the charity auction?