Apple released new devices iPhone 5, iPod Touch, Nano with new Lightning connector. If you have old iphone or ipod accessories like Logitech 30 pin speaker or iPod Speaker Dock etc, you can’t use them with your new iPhone or iPod. You have to buy Lightning to 30 pin adapter to use them.
Compact Lightning to 30 Pin Adapter
This adapter is compact & connect to your older 30 pin accessories. It supports analog audio, charging, usb audio.

credit:apple
Lightning to 30 Pin Adapter 0.2m
This adapter is 0.2m long. You can use this if you want the extra length. It can connect any of your older iphone or ipod accessories.

1. Apple
Apple has compact lightning to 30 pin adapter for $29. You can buy it online from Apple Store. It works with iPhone 5, iPod Touch 5th generation, iPod Nano 7th generation models.
Lightning to 30 Pin Adapter 0.2m is available from Apple for $39.
2. Amazon – Cheap Lightning to 30 pin adapter
Amazon has few adapters from different sellers under $10. Please make sure to check the reviews before buying on Amazon.
3. eBay
eBay has few sellers selling Lightning to 30 pin adapter for about $10. If you want to try cheap adapter, you can buy it from Amazon or eBay.