I found on ebay those auction:
A black Cadillac Escalade
http://cgi.ebay.com/ws/eBayISAPI.dll...sPageName=WDVW
A silver Cadillac Escalade
http://cgi.ebay.com/ws/eBayISAPI.dll...sPageName=WDVW
With a mad price of $54.99
I didn't see a entry on radioshack website at this moment