I asked a local installer for a quote and it was $700-$800 for 1500ft range keyfob.
More like $1000 installed for the "unlimited" range through my phone.
I'll just get in and drive it to warm it up, unless it's -20 out (maybe 2-3 days a year) the car is fully warmed up and burbling/popping after 4-5 minutes of gingerly driving.
Not worth it for a car I'll only have a few years IMO.