The first person who scours the Friar's Hole parking area in West Virginia will find a cheapo LED headlamp I looped over my helmet during an OTR trip (but didn't loop on well enough). Bought at a Wal-Mart for $11.99, it provides a soild amount of nice white light (or red light, if you flick the switch to the left) off three AAA batteries, and still has most of its juice left.
Limited time offer.