Ghost Blitz: 5 to 12
We took Sea Salt & Paper on an international trip (with a few other two-person games), and it quickly became our favorite. The game is compact and can be played on a small surface, and you can play a single short round or multiple rounds (accumulating points). The artwork is beautiful, and the gameplay is dynamic, especially with the "stop" vs "last chance" decision. Highly recommend!
perfect size for duo play
After Cribbage, this game is my second favorite card based game.
While the supplies are basic, you could print and play your own, this game is worth the price and I'd gladly pay for it again.