Arm/Bicep mount…

So I’m thinking about getting a GoPro and I don’t wear a helmet so I’ll need an alternate mounting option. The chest mount won’t work (POV will be wrong) and I don’t like the head strap option. I looked for something that would attach to my arm/bicep (on my down-hill arm – I don’t ride switch) but couldn’t find anything outside of a homemade version that a guy made on YouTube.