Direct vent wood burning stoves do exist but make sure you do overkill on what is considered code for your area. They pump out a lot of heat and you need to consider carefully where you will put it. They have the most difficult code to comply with.
According to their website, Vanguard makes them:
You can google the alternates or just visit the grill stores like http://www.woodburningstoveslimited.com http://www.ibuyfireplaceparts.com http://www.amazon.com