I find it’s really dependent on where you’re going and if they have active tech diving/filled bottles.
For example, I flew to Florida for my Mod 2 and the shop had a few stages already filled with trimix. I just was charged a rental and for any gas used. If the shop has no use for a full cylinder of trimix then there is a good chance they have to dump it anyway.
Ultimately I’m in rjack’s camp. If I’m flying somewhere for only a few days, the chances of me doing full trimix rebreather dives where I can’t borrow filled bottles are pretty rare.
For example, I flew to Florida for my Mod 2 and the shop had a few stages already filled with trimix. I just was charged a rental and for any gas used. If the shop has no use for a full cylinder of trimix then there is a good chance they have to dump it anyway.
Ultimately I’m in rjack’s camp. If I’m flying somewhere for only a few days, the chances of me doing full trimix rebreather dives where I can’t borrow filled bottles are pretty rare.