The outlets & switches are done. I use foam insulators from the hardware store - $2.16 for a six-pack, and I bought 3 each for outlets & switches. I have leftovers, but I will simply put those into my toolbox and use them when we move again.
Before & After:
If there is too much open space on one side, I cut the edge of a switch cover and taped it on the insulation. I learned that North walls need to be done first, then the rest of the exterior walls, then the interior walls. There have been one or two that had actual breezes coming through the outlets.
For the cable hookups, I used a switch cover and cut a slit from the bottom to the center opening. Worked great.