I have a short for letter domain with a 2 character extension available.
COLO.AM
Intended on using it for a colocation related venture, but I've decided not to venture into that business since I am an on-hands sort of admin and have relocated far from any reasonable datacenter that I'd offer services from.
Starting Bid: $7 (revised - sorry)
Auction Ends: Saturday, 7PM Eastern Time Zone - or 96 hours from this post)