Nice find. I'm hoping he wins the Championship this season. I think this is his year.
Specific information... That color scheme is from the car he raced in the Auto Club 500 in Fontana, Ca., the 2nd race of the 2010 season. It was promoting the new "Amp Energy Juice" He didn't do well, only finished in 32nd place. The good news is that he is still Nascar's most popular driver and he is doing real well this season. I'd start it at $99.99 and see what happens.
Nascar drivers signatures are common and there are many, many of them out there from every driver. They are encouraged to sign stuff for the fans at every race.