Buy.com has Cyanics Portable Swing Speaker with Protective Case for iPod Nano 4th Generation - IPS-26 - $18.99 + free shipping.
2 in1 Portable swing speaker system with crystal clear protective case. Compatible with iPod Nano 4th Generation (8GB and 16GB). Insert your iPod inside the case and swivel the speaker housing into upright position to turn on the speaker. Speaker works with vertical or wide-screen viewing. Lightweight, mobile and high performance stereo speaker. Built-in rechargeable battery and plays up to 8 hours of music. LED displays for charging and operation status. Audio jack for headphone when speaker is not in use. Great for indoor and outdoor. Battery Built-in Li-polymer. USB charging cable included. iPod not included.
Cyanics Portable Swing Speaker with Protective Case for iPod Nano 4th G $18.99 FS 
