Cheap NG insert? Direct vent or vented W/ Blower and thermostat

NBABUCKS1

Member
May 9, 2013
42
Wasatch Front, UT
It's for a downstairs bedroom with a fireplace. I currently have a natural gas fireplace in there that vents out the chimney through 4" chimney liner

From an efficiency side, I figure a no vent would give the greatest efficiency. I want one with a blower and a thermostat. I don't really care how it looks.

Any cheap ones you can recommend?