You can probably find a worm drive for cheap on CL.
$50 probably...light it up before you buy it.
No rumbles (bearings) or no sparks (brushes) and it's good for a long while.

If you're right-handed a worm drive is easier because the blade is where you can see it. The motor is inline so it's not as squirrely as a sidewinder.

Lefties like sidewinders because the blade is on the correct side for them.