I bet your dealer might've allowed you a discount at the time you bought your bike, with that there are a lot of choices. If there are a lot of street lights on your route, you don't need much for lighting and you won't have to spend much. Best light I ever had was a Schwinn branded one I bought at Walmart for cheap. Unfortunatly, I used it as a flashlight also and now it is where all lost flashlights wander off to.