lost keys! help.

Hello.

I think I just misplaced my only set of keys to my range rover. I read online that to change the lock through the dealership is awful expensive. Do you know what my most practical option would be? I looked online, and someone is selling uncut keys (with remote) to range rovers. Is this a option? Can the locksmith do this for cheaper? It says that I have to get the remote/alarm system reprogrammed? The car is not driven very often so the battery is also dead, so if I don't have the remote won't the alarm go off when its jump started? =(

Anyone's advice or input is most appreciated.
THANKS!