you can't beat ebay as far as price there is tons of competition and selections. i get mine from there have never had any problems and you can get all kinds of useless accessories with it too probably.
ditto on ebay. also, if u need a car charger, u can get one for ~$.99 (plus a load of shipping) and still comes to less than half what the retail stores sell. there is tons of OEM stuff coming out of Asia that folks buy in bulk and unload on ebay, and with this stuff (how long will u have your cell phone for anyway??) it is the way to go.