Reelight is another source for magnet lights, see: https://www.reelight.com/en/

However magnet, ie induction, lights are the dimmest of the three types, battery, dynamo, and magnet. These magnet lights are so dim they're only useful as a dim to be seen light and not one to see the road with. Plus these aren't entirely friction free but they are quite a bit less than a dynamo.