I do not know. But if I found one laying in the street. I would go to Ebay and see what they are going for. That will get you close anyway.
Make sure you check completed listing. Not what people are asking for BUY IT NOW. Check the the completed listings and see what they are selling for after all bid are done. Make sure you match condition as well.
From what I see they really dont sale much....I thought it was rare and vintage. I was going to sell it to get money so I could work on my first racing cart, and I was going to sell my wii with games and 2 controllers and playstation 2 with one controllers and games