Amazon has the Energizer X1000 Rechargeable Detachable Headlamp for $25.26 - 50% off (click "Save an extra" box) = $12.63 with free shipping on $25+ or with Prime.

1000-Lumens in Turbo mode (400-lumens in high mode), comes with two CR123 batteries / USB charging cable, runs up to 55 hours on low, detaches to be used as handheld light.