1SaleADay via eBay offers the Griffin Road Trip Car Charger with FM Transmitter, model no. NA22038, for $14.99 with free shipping. That's the lowest total price we could find by $5. (Most vendors charge $50 or more.) Features include 5-watts output, a flexible steel neck and cradle, one-button setup, and recall frequency settings. It's compatible with iPhone 4/4S and 3G/3GS, iPod, iPod touch, and iPod nano.