The front and back seats and door panels ran about $900
The seat heater elements, front only were about $200
The switchs from Toyota (stock item) were around $150
I did the install on all of it myself and saved that cost.
To order seat heater elements from Toyota, you have to get
the whole seat cushion. They are around $400 for each
seat so just ordering elements from an aftermarket supplier
is much cheaper. As is installing these items yourself.
It's not that really cold here in Nashville but cold enough in
the winter to get some use out of the seat heaters. I've had
them before and really do like them. Since I had the original
seat covers off putting on leather, it was easy enough to just
add the heater elements while I was doing it.