I haven't seen it here, and it just "sneaks in" under the $100 threshold - but the Cateye SingleShot is a fabulous light. I'm a commuter and in Luxembourg it gets very dark very early (we are at a very Northern latitude compared to the US - just north of Winnipeg I suppose).

I bot the SingleShot Plus (lists for 140usd) on eBay for 89 which might have been a once in a lifetime event. But the light is amazing.

I get enough light to lightup the road - it also has a blink option so I can improve my "be annoying and be seen" look.

Best part - it probably throws as much light as my old fancy lights (with the battery as bit as a bidon) but the light is self contained - no separate battery. Charges fast and frankly, never seems to need a charge! I ride 15km each way every day - I think I've plugged the thing in four or five times during the course of one full winter season.

I think this might be the best bike accessory ever.