I bought an LED customizable marquee nametag for $30 at a convention. It makes sense for a con; but it also works at any function where you'd have a nametag even better than those stickers since it can cycle through 8 messages (it holds up to 4097 bytes) and can even display images (though it is only a monochrome display so B&W pixel art works best) in a myriad of patterns as well as flash.