After so many registrations (more than 410,000, now) with in few days of General registrations. You can still find dictionary names and 3 letter names available. I will update them here and will add to this list more and more names daily..
Dictionary Names
terminate.co
afghanistani.co
mosquiotes.co
4 letter LLLL .CO
oder.co
3 letter LLL .CO
zyq.co
2 Words
searchhome.co
If you find these domains as a good opportunity to buy, you can purchase them from Namecheap. It is offering .CO domains at cheap price as compare to other sites.
If you like this information than you can Hug Me (Help us to Grow).