The best sleeves are from Ultra Pro (http://amzn.com/B005CM80X0). The sleeves from Mayday Games are thinner, so they split easily if you try to shuffle the cards. Worse, the Mayday sleeves STICK to each other and you really have to double-check the cards when you sort them after a game. The Ultra Pro sleeves don't split and they don't stick. The only downside with the Ultra Pro sleeves is that they're a little bigger, so the cards don't easily fit in the storage slots in the box. They DO fit, but it's tight.