Glad someone posted the link for ElectricFirePlaces direct, I've been shopping one for a basement remodel in our stick house and they have lots to choose from.
Dimplex is the brand Northwood uses and on the NROA forum several have posted favorable comments.
I picked up a unit that included a surround since the size of the firebox will fit in the area of our fifth wheel. I'll scrap the surround, maybe use some for trim, but the biggest thing for us is how much noise the heater makes. We use a portable heater do let the place we are camped pay the heat, but mostly cuz it's so much quieter than the furnace. The fireplace we picked up was at a local store and plugged in so we got to try the sound it makes before buying it. It will be a project this winter when I have a few days to play and make it fit.