woodridsge,
I have a Dimplex Model 2500L. It was installed by dealer as part of deal. I dont have a cost. It is remote controlled and produces good heat and is fairly good as far as looking like a real fire.
It goes under your TV and the cabinet is removed. If your handy I guess you could do it. You will need to run a dedicated line back under Master bedroom and install proper breaker.You must remove cabinet and the wall in bath. The fireplace is not the top of the line but it is nice to have and is sufficient heat.