The Deal Brothers found a deal on the iHome iH85 Bike-to-Beach Speaker System for iPod for $39.95. This system ships for free, and it clamps to your bike frame. It has a remote that attaches to your handlebars so that you can change music without taking your eyes off the trail.
Check It Out: iHome iH85 Bike-to-Beach Speaker System for iPod: $39.95