I bought a new iphone4, you know, in order to take good care of it I must give it configuration more iPhone accessories. If you know where I can buy cheap and practical fittings is OK.
So thanks.

Try Ebay as a first port of call.

I've used cellphoneshop.net for phone accessories. I've found their prices phenomenal. So low that I was initially afraid to buy from them. But I have made several purchases and have never regretted them.