For really accurate ephemerides for observation, Don Yeomans at the Jet Propulsion Lab has provided both orbital elements and a daily ephemeris of comet positions.
Hourly ephemerides computed by David J. Tholen's 2-body ephemeris program at the Institute for Astronomy, University of Hawai`i are currently available for the following months: February, March, April and May. If you wish to purchase a newer, up-to-date version of his ephemeris software, you may contact David Tholen directly at 808-956-6930, or e-mail at tholen@ifa.hawaii.edu.