Is it possible to hard wire the cable to the cars electrical system? I don't know anything about currency and whatnot

Well, let's see. A car runs on 12 volts DC, which is a ten and two ones, or two fives and a two, or a five, six ones, two quarters, three dimes, a nickel, and fifteen pennies.

Oh, but then you'd have to adjust for inflation. Hmm, tricky...