Retractable iPod/iPhone 3G/3GS USB Data and Charging Cable for $4 with free shipping, and coupon code MP3AOFF25P gives $1 off in the cart. Code works on any quantity of this item in a single order.

It extends out to about 2.5 feet, and retracts to about 3 inches. It locks at various lengths, and the quality of this cable is a little better than other overseas-made iPod/iPhone charging cables we have used.