I've been searching through the rabbit hole of mass produced FNaF fan designed plushies. Here's a fan designed Funtime Freddy with Bon Bon plush preorder. $50 USD. It says there's only 20 left, so I'm guessing once those orders are filled they'll be manufactured. I'm not sure though. I don't know what's going on it with considering the artist hasn't tweeted about it for nearly a year, but if anyone's interested you could try contacting the artist.
https://ko-fi.com/s/03d220ae98https://twitter.com/frechiiie 