I still use a Mini-14 (in a Choate pistol grip stock) as my primary rifle. The value will depend on condition, of course, and a buyer who wants the stock. I don't like folding stocks so if I bought something like that I'd transplant it into a conventional stock, so the folder, despite its rarity, would be something I would pay extra to get.
You should be able to get a good price for it if you find someone who wants the stock.