Grey felt & black leather sleeve for 13" MacBook Air: http://www.byrdandbelle.com/collections/macbook-air/products/macbook-air-sleeve-gray-felt-black-leather-patch-ls
Used but in good condition. (Goes for $60+shipping new.)
Brand new, with one defect: the snaps under the pocket flaps are missing; it came this way and I didn't bother to return it because I didn't care about being able to snap down the pockets. Can be fixed fairly easily if you care to, though. (It's not visible from the outside, so I've added a photo to show you what it looks like.)
70% wool, 20% poly, 10% cashmere. 18" shoulders, 20" pit-to-pit", 25" length, 25.5" sleeves. Fits slim, especially in the sleeves. Awesome...
Worn only once or twice, good as new. Waxed cotton. 18" shoulders, 22" pit-to-pit, 27" length, 26" sleeves. Fits somewhat large/boxy so it can be worn over other outerwear.
Price includes shipping within the US only, inquire if elsewhere.