I have an M3 Folder I bought in CA right before the 1989 assault weapon ban. It just sits in the safe and I've considered selling it from time to time, but I don't see many (or any) for sale when I research what it might be worth. So I never bother with it.
But yeah, I'd be willing to sell mine and maybe get something else fun or interesting.
This is an actual picture of it from back in 2019, the last time I thought about selling it. I can get you new pics if you're actually interested.
Thanks!
https://photos.app.goo.gl/9mutEyBKahM6RaYaA