Someone might want another coupler because some beers require different types of couplers.
Yes, it's usually easy to find someone to re-fill co2. Look up gas supplier or welding supplies in your yellow pages. Or, what I do is go to a paintball shop. Most of them refill co2 as well.
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Sometimes when I reflect back on all the beer I drink I feel ashamed.
Then I look into the glass and think about the workers in the brewery
and all of their hopes and dreams. If I didn't drink this beer, they might
be out of work and their dreams would be shattered. Then I say to myself,
"It is better that I drink this beer and let their dreams come true than
be selfish and worry about my liver."
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