We use Amerigas who fills the tanks at Shep Browns. We manually schlep the tanks to Browns -- a bit of a hassle, but depending on the number of tanks you have, you can limit it to 1X/yr.
Need a decent workboat and a hand-truck. I know there are some services who will swap tanks/fill tanks for you on the islands too, but it's not cheap. I'll check back if I find the names/contact #'s.
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