Iceland owns the .is domain and recently (April) opened it up for registering from anywhere. I was surprised to see how wide open it still is, with only 64k domains taken. There are even a bunch of 3 letter words still available.With .io domains getting squatted left and right, .is seems like a good alternative.
NameCheap has them for $33: https://www.namecheap.com/domains/registration/cctld/is/