How much would a dealer charge to fix a conventional door lock on a 2000 328i while it still works on remote?

im not sure i understand your question. but it the door latch assembly will not work correctly with the door handles then either the cables are bad or the latch is bad, it depends very much on your situation, if a cable is bad then $200 bucks perhaps, if the latch assembly is bad then $800 dollars perhaps, since you didnt leave a lot of info on what is happening with the latch i cant help you that much. good luck.