Best bet is look with google and you can get great pricing from other dealerships out there that move high volume. Not aware of anyone that sells Acura/Honda parts other than the dealerships.
My wife just asked for remote start this year so your thread caught my eye. Going to go with aftermarket for mine most likely to get greater range. I haven't seen a lot of info on the Acura remote start and it requires a trip to the dealer after install to get programed. Too much hassle and additional cost.