Just in time for the approaching winter, Best Buy has a pretty sweet deal for a 2-way vehicle remote starter as well as for the DroneMobile add-on, which enables smart-phone access + fee-based cell service to start & control your car from anywhere within cell range, as well as GPS tracking with the premium plan.
Compustar CS4202 Two-Way Remote Starter Kit + Ball Bearing Tilt Switch (security feature)
Cost: $250 + tax NLA
Savings of $290 over retail price of $540
Cost: $150 + tax
Savings of $40 over retail price of $190
Total Cost: $400 + tax for both devices, with free installation at any Best Buy auto mod location
EDIT: If you'd like to get clever, pick up the DroneMobile from Jet.com for $90 and then have it installed anywhere. Best Buy charges $40 for just the install, so buying from Jet.com will save you $20 over the Best Buy all-inclusive price.
Courtesy of MysteriousKarma:
note that DroneMobile costs 6-25 dollars a month, and you can save 20% by paying annually.