A1) I don't think this is something you would find in a store or online, unless someone was selling it on Ebay. This seems like a very rare item since Moneca isn't really active anymore. You'll probably just have to settle for finding the trading card itself and hopefully run into Moneca and have her sign it. That would be more special anyway.
A2) you can get the trading cards signed by moneca at katsucon 2013 ill be on the heros pannel as poision ivey ill e more than glad to sell it to you thatsvif you can g ill hold on to it if you dont see me