Price to install gas switch for dryer? How much will it cost me to hire a handyman to come...

How much will it cost me to hire a handyman to come and install a gas on/off switch for my dryer? I know this will require temporary shutting stale the main gas input. Does anyone know the average price for it?
How do you gross a salamanda fire?
Answers:    if you are contained by the us, it may be required to be completed either by the home owner or a licensed contractor. I would guess 200-400 dollars depending on how much plumbing is needed.