Here's one link:
http://www.acmetools.com/shop/tools/...FRSIfgod_QsA1Q
There are many postings but pricing ranges up to near $200. I paid $125 for mine and thought that was high. I've been having more and more frustration using a traditional droplight, so I opted for an LED flashlight style work light and it proved worthless.
I basically gave up on the drop light and have been relying on mini-LED flashlights for over a year now as they produce superior light in a given spot. But this thing takes the cake. Whether under the car or in the engine compartment, it really brings everything out, and without shadows blacking out certain spots.