Game stores that sell collectible card games ALWAYS have racks of the Ultra Pro sleeves. For CC, you want the same size as Magic: The Gathering - in case that helps.
You can also check them out at
www.ultrapro.com to see what they have available. They not only sell sleeves - they also have a large variety of deck boxes with some slick artwork.
I'm super geeky, so I color-code my decks for every nationality. The sleeves I buy come in packs of 50, so 2 packs leave extras for the eventual replacement for damaged sleeves. Ultra Pros are pretty tough, but my decks see a lot of travel and a lot of play time.
Once you sleeve, you will need to learn how to shuffle differently, too.