This one?
it is listed on the guide but doesn't have a price. As with all hotwheels and all Cobras... it's worth whatever someone will give you for it. You trying to sell it?
The car is listed about 1/4 way down the guide, #14014
http://www.southtexasdiecast.com/hwg...ssiccobra.html
If you have other hotwheels, click the top "return to guide" section. There is likely not a price listed for your cobra because they likely haven't seen one sell. i'd bet of the 500 sold, 99% were to collectors who won't ever sell them. "The purpose of this price guide is to give collectors an online resource for collecting Hot Wheels. Values are based on the average selling price on eBay, TTP (The Toy Peddler), Yahoo! auctions, and local shows."
BTW, if you do want to sell it, let me know. I would be interested! It would make a great addition to my collection!