Indeed - I normally only need new inflators at service time, but this year I needed a CO2 cartridge as well. I refrained from posting earlier as I'm not certain how it was sent, but it was put through my letterbox rather than signed for and I'm maybe 75% sure it had Royal Mail postage on the packet.
Personally I'd happily post a lifejacket to a mate, with the cartridge unscrewed but wrapped in a layer of bubble-wrap or something and packed inside the parcel.
Pete
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