Do they make post cards from Giant’s Stadium???
You could sign it “From one son-of-a-bitch that got took out”
Lots of places that do photo printing have postcard options; just bring the image on a USB flashdrive, SD memory card or something of that sort. Some of the computerized printing kiosks even let you type in messages for the back of the postcard, like so:
"Dear Jimmy, Wish You Were Here!"