I went with the Zefal set from Wal Mart for $ 17.97 plus tax. The instructions and actual battery cage for the front light was incorrectly indicated for battery installation of the 3 AAA batteries. Had to play around with that to get it to work. The rear light was way too easy, which is how I like it.
Anyway, it's a be seen by others only and limp home, but still ride slowly. It's before sunrise & after sunset legal, but you'll want to ride with street lights if you still have a ways to go to get home.
Had it for a few hours and used them tonight for a test ride, I'd say the quality isn't the greatest, but for under $ 20, they're serviceable units. See how they hold up ?