My older brother has a very good friend who owns a 2008 Supersnake he is thinking of selling to acquire a 2014 Stingray. He already has a 2011 ZR1 and wants to drop the Snake to get the Stingray. The car barely has 2000 miles on it and just sits in his garage. I have not been able to find any information on current market value on these cars. Any guesses?