Any one know suppliers for iPhone Battery Accessories?

I'm looking to buy an emergency battery charger for when you have no power source and i'm also looking for battery replacement kits. Do you know a place that has them cheaper than eBay. I'm looking to buy them for myself. Or is eBay the cheapest place to get them since most come from Hong Kong or China and are mostly wholesale price.

Hi wilmer007:
I am currently also looking for a partner in this field. If you are still interested please pm me. We will discuss about this