If you think the Starry AM/FM Cooler is too small and you don’t like rolling along the Rolling Cooler/Audio System, maybe the Wagan Thermo Sport Fridge/Cooler ($110) will do the trick.
By connecting it to your car’s cigarette lighter the contents are cooled down to 40 degrees F. The 16-can (10.5 L) capacity bag features a two-speaker radio and an input jack and storage pocket for your iPod.
(Update: Link removed because the page is gone and this product couldn’t be found elsewhere. However, we have plenty of Coolers and Camping Gear to browse.)