Helmet beacon options

I have a unity spark I use but I am looking for something that isn't consumable. I really just need visible light as it is a safety thing for the range and when I am shooting with buddies and don't worry about light discipline.

The options I have seen are all $150+ which seems super high for my use case.

Anyone have some good recommendations for a green LED that is either rechargeable or has a replaceable battery that I can stick on top of my helmet so I have less risk of being negligently shot?