Latestbuy, $29.95 latestbuy.com.au Carmakers have some catching up to do. This seriously compact vehicle can run on solar energy alone, as can its remote control. The Solar Rechargeable RC Car has a solar panel on its roof that powers a rechargeable battery. Leave it in the sun for two hours and you get 15 minutes of playtime. A USB cord lets you charge it with a computer.