I haven't personally purchased one there, but would say with about 95% certainty that yes you can. I have purchased gas pipe there, and they have every other type of valve you can imagine there.
Yes you can
Yes you can but have a sales person help you choose the correct one. Gas is corrosive use the wrong one can be deadly. When installing do the required soap test. If I were you have a pro do the repair.
If they don't have one, they will happily tell you where you can go buy one. Top-notch customer service at Durk's!
My guess would be yes that they have gas valves. I know they have water, shark bite and sprinkler valves.
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