We’ve covered lighted pickup tools here and here, but you may not want a magnetic head sticking to every metal surface as you fish it. If you just need to shed some light on a hard-to-see place, a single purpose tool like Steelman’s 16″ Bend-A-Light might work a little better. It’s simply a high-intensity bulb with a flexible brass shaft connecting it to the battery case.
The Bend-A-Light ships with 2AA batteries and a protective cover that doubles as an extension handle. It’ll run you about $17, but if you need a replacement bulb you’ll shell out at least another $7.