03 Corolla ( Engine Light ) Evap Purge Valve?

Hi All, I was wondering if anyone could help me locate the Purge Valve on a 2003 corolla S. I was driving down the freeway the other day and the engine light came on. I took it to Autozone and the codes I got where P0440, P0441, and P0446. With P0446 and P0440 being registered twice. This also happened two weeks ago and I thought it might be the gas cap so I tighted it and had them reset the codes and now it's back. I was told that it was probably the Purge Valve. I was wondering if the purge valve and the canister are sold seperately or have to pay 200+ for the Canister? I need to locate it on the car but can't seem to find hardly any information about it on the net more less a picture. Can some one please HELP me OUT... I have a big trip planned one week from day and gotta get this fixed without going to the dealer because frankly I don't have funds to give them almost 400 dollars to fix a 200 dollar problem... (65 dio fee + 65.00 Flat Rate Labor + plus the part which has to be bought at the dealer and cost 250.00)

:banghead: :banghead: :banghead: