They seem to be rare as hen's teeth.
You might want to go with the Mr. Heater Little Buddy. I've got one and works well. It has an oxygen sensor and will shut off on low oxygen; a safety feature which the Coleman doesn't seem to have.
Mr. Heater Little Buddy Heater - Walmart.com
Only problem with these is they are a bit unstable; easy to kick over. This one has a higher output and is more stable; also has the oxygen sensor:
Mr. Heater Portable Buddy Radiant Heater - Walmart.com
1988 Coleman Sequoia - popup (1987-2007)
2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10