There is 25 bull tags left over for the 10/10-10/14 season and 386 for the 10/17-10/25. No leftover later season or Cow tags available, Also no deer tags. Here is the leftover list the are list by hunt code. You are looking for EM019O2R or O1R They will go one sale via the internet the 12th of August.
http://wildlife.state.co.us/hunt/Big...f/leftover.pdf