How much does a Catalytic Converter cost?

My mom's been told her Grand Dodge Caravan needs a Catalytic Converter and some sensors. About how much should it cost, labor and parts? Thanks for helping me out peeps!|||the shop i always goto charges i believe no more than 300 for eveything..|||it depends on what kind of cat. converter you get. you can get the universal type like i got then they are cheaper then the original ones and they work just as good.|||Kyle is within range.