Although car windows are necessary for navigation, they're also the No. 1 vector for the unlawful entry of carjacking UV rays. Shield your vehicle from damage with today's Groupon: for $60, you get $149 toward Standard Heat Buster window tinting from Tucson Auto Tint, a division of Royal Auto Glass and Tint.

The glass gurus at Tucson Auto Tint repair, replace, and tint windows and windshields. Like the blue-filter version of Casablanca, the Standard Heat Buster tinting uses dyed film ($149+), covering windows in SunTek tint and bouncing 99% of harmful UVA and UVB rays out of the car's interior with ID checks at the doors. The process typically takes about 2.5 hours, so vehicles can be dropped off and picked up on the same day, or technicians can make window-darkening house calls. SUV and station-wagon tinting is available with a $20 upgrade, Corvettes and Volkswagen Beetles are an extra $30, and imaginary hovercrafts are tinted free of charge. The three-year warranty protects against bubbling, peeling, cracking, and being strafed by Canadian fighter pilots.