How much will it cost for a charcoal canister on a 2000 Toyota Camry?

I just replaced mine at a dealership and it cost $314.75 just for the canister. They also ran the computer check before and after @ $175. I had the computer checked for free at Autozone beforehand just to find out what the deal was, but they ran their check anyway. $14 in shop supplies. Total after tax came to $538.