signed cards

I'm trying to find a way to duplicate signed cards, either during the performance or before the performance, maybe using some sort of dual reality. If you had any sort of suggestion or places I could look that would be great. Thanks

Hello! I've been doing magic for a little while, but I wouldn't consider myself an expert, yet. I only do card magic, and I am not very good at using other props. I have seen how much of an impact having a spectator sign their card can have, and I'm going to start including it in my routine...

Some tricks I create or perform require me to destroy or make cards unusable. I am always left with partial decks that have no use to me. I hate to waste good cards but have no idea what to use them for. Any ideas?