I saw one last summer at a flea market that I thought was in amazing condition with a stick shift. I think it was original except for maybe the tires. When I asked how much it was, the seller was asking $600, and I thought that was too much. (I really don't know enough to appraise them).
I currently have a red one in worn condition that a friends father gave me to restore for his grandchild, I was originally just going to make it ride able again for him, and not pay attention to keeping it original, but when I told him I think it might be worth a little bit of money, he told me to take my time and try to sell it for him instead. I'm still missing a rear fender, a right side break lever, and the seat has a few tears. Since he is not in a rush, I haven't done much with it yet, and I'm hoping to do a little research and maybe find the original needed parts somewhere next summer.