Specifications:

Macbook Air 13"
128GB, 4GB ram 1.7GHz
OS X Lion
Battery cycles 330 (72% compared to original)
Small stains on screen
Metallic body in great condition
AppleCare (expired in October, 2014)

I bought this in October 2011, and it's in a fairly good shape except the battery life.
It's been working great but I'm selling it because I upgraded to Macbook Pro.

$700, Cash only
Trade in person only on Stanford campus, no shipping.