The best accessories for iPod/iPhone are manufactured by Belkin.
You can buy them from any leading electronics store, e.g. eZone, Reliance Retail, etc. if there are any in your city.
Else you can buy them from eBay.in too...
Here you can find in detail about the accessories available--
*www.belkin.com/ipod/
They are a bit costlier, but of excellent quality. I have got a couple of them for my iPod Classic!