RE: Portable Heater for Inside
We use a combination of things, depending on available power. We've used all three with good success in below freezing temperatures.
When boondocking, we use the Coleman Black Cat catalytic heater. It's advantages are that you can move it around inside the camper depending on where you need better heat. You can also heat up the bathroom.
When we have hookups, we have a small ceramic fan heater which is good for instant heat, but a bit noisy. My prefered choice when shore power is available is this unit HERE.
RE: Bigfoot closes
I live about 5 miles from Arbutus RV (they have several outlets here on Vancouver Island). Ironically, they have only been a Bigfoot dealer for about 2 years, robbing the distributorship from another dealer right across the street who had been a Bigfoot dealer for as long as anyone can remember!
If they do as suggested (3 year warranty) this is a much better deal then what was available with a new purchase (only one year!).