here is something you can install on your own if you are handy.

run a pipe of approx 1" diameter from the house plumbing and route it
to the driveway.

make an indentation into the driveway concrete along the higher point
of the driveway but the pipe stick out of the driveway just slightly.

along the edge of the exposed pipe, drill small holes so that water can
exit out and flow down the driveway.

connect it to the hot water line of the house and whenever you need to
clear the driveway open the valve and woalla.

it wont use nearly as much energy as any of the $$$ systems since it
won't need to heat the entire concrete slab. instead it will get under
the snow and loosen it so its real easy to push off the driveway or
just wait till it completely melts.

you could even connect it to the cold water source since even that is
warm enough to melt snow.