Verify there's no rust inside the cabinet and other basic integrity issues. Yes parts are easy to come by. If it were me, I'd have the seller connect the tank from his other gasser to prove it'll ignite. Otherwise, you're out another $10 or $20 to fix that, too.
If you were here I'd have a 3-burner gasser for you. Add your location to your profile, maybe a note for your signature too, so we know what you're looking for.