The SONY Personal Audio Docking System for 30pin iPhone/iPod Model 4–266-548–12 (1) is a black rectangular audio dock designed for Apple devices. The Sony brand ensures quality and reliability in this audio docking system, ideal for enhancing your listening experience with your iPhone or iPod. In great condition and comes with all parts. 
eBay
Tested and works
eBay
Bose Wave Connect Kit Dock Docking Station for 30 Pin Apple Ipod Iphone MP3 AUX No Cord Included, Dock Only As Shown Shipped Fast & Free!
eBay
eBay
Now using this receiver that inserts in the Aux Input socket, you can continue to enjoy your speaker dock and avoid obsolescence due to the later Apple iPhone/ipod connector not being compatible. This device allows wireless connection to any Bluetooth enabled device.
eBay
eBay
The Bose SoundDock XT Speaker is a portable speaker system designed specifically for iPhones and iPods, featuring a dock configuration for seamless connectivity. With audio inputs supporting both Apple Lightning and 3.5mm Jack connections, this speaker allows for easy connection to a wide range of devices. The compact and sleek design in white or grey colour options makes it a stylish addition to any space. The integrated charging capability ensures your device stays powered while enjoying high-quality sound. The Bose brand guarantee ensures superior audio performance and durability.
eBay
Tested and working iHome iH52 3-speaker iPod docking system. Includes subwoofer, dual satellite speakers, docking base, cables, and original box. Remote is NOT included. System is in good overall condition with normal cosmetic wear. Display has light surface scratches but functions properly. Box shows storage wear. Great vintage iPod dock system with strong sound and nostalgic appeal.
eBay