Yea I'm not sure of the rarity myself but I think it comes from people not knowing what they are and just pass it off as no big deal. The only made them from 84-85. I see them once in a great while on ebay but thats it. I got the burst from a friend of the family and did some research before I found out what it was. The black one poped up on Ebay and I had to snatch it up.