"Check Engine" light on 2002 Hyundai Elantra

Took my care to AutoZone due to the check engine light remaining on while driving. The car is driving normally, how soon do you recommend I get this repaired? Autozone discovered it was an evaporative emission system situation OEM Number to Cross: P0441

Asked by for the 2002 Hyundai Elantra
P0441 set in your 2002 Hyundai Elantra referrers to incorrect EVAP system purge flow. If your car is driving normally it is probably not critical that you get this issue repaired immediately. It does mean however that the EVAP system is not functioning correctly and as a result your vehicle is allowing more hydrocarbons in the air that it was designed to do. This will cause you vehicle to fail a state mandated smog inspection.
Thanks for your response. What would be the estimate cost of getting this repaired?