Where can I get a solar panel to charge my electronics?

In about two weeks I am flying up to Oshkosh, WI for Airventure, a week long air show for aircraft owners and fanatics. For the people like me who fly there and camp out, they have a bathhouse to charge things like cell phones, laptop, etc. but I never have felt safe leaving my things there while they charge. So now I want to buy a solar charger so I can just let them sit in my tent with the solar charger in the sun while I go admire the air show and and planes on display on the tarmac.