BMW 325 E46 Key

Hi Every one



I am having serious problem with the key, I would like to buy a new BMW key for my BMW 325 E46 2003. In Australia I asked BMW dealer, it is costing me around 700 Aus dollars.



I heard its cheap in USA, Can some one help with the info where to buy, also If I order from overseas, would it work on my car, I mean do we need to do some programing etc.



Also my lock cylinder is broken, I can't lock the doors, refmote battery was old problem.



Please Help me



Thanks