edit: Not sure why this is getting downvoted. The price difference is unlikely to have much to do with the physical costs involved. Political campaign stores typically have inflated prices as they're fundraising efforts.
Nope, this has been around for a while. It's not an original idea, but it isn't meant to be. He didn't "steal" it anymore than he stole campaign yard signs or promotional pens.
https://supporters.eff.org/shop/laptop-camera-cover-set