'Frugal' means different things to people with varying preferences--to me, buying an Apple Watch isn't frugal. Even if you're frugal, pretty much every car that

'Frugal' means different things to people with varying preferences--to me, buying an Apple Watch isn't frugal. Even if you're frugal, pretty much every car that doesn't have Bluetooth A2DP has at least an AUX input, and the ones that don't can either add one as a CD changer emulator or have a tape deck (and thus can use a cassette adapter). Pop in a $13 Bluetooth A2DP adapter on the end, mount your phone on the dash or windshield, and boom, you can stream music while car nav interrupts only when it has something to say. Much cheaper and better solution than a vibrating watch.