I don't know if this helps. I see that this thread is a little old now...
Ethyl Chloride is highly volatile (which is why, I presume, they put it into these atmospheric bellows). It's used in the developing world as an inhalational anaesthetic but it's not without its problems - it can cause funny heart rhythms and organ damage and is highly flammable. In the UK and the USA this is an obsolete application for it.
However, you may find a friendly anaesthetist (anaesthesiologist) who can get some for you. Over here in the UK we use it for testing loss of temperature sense. Briefly, it works like this: being volatile, when dropped on the skin, it evaporates radidly taking in latent heat of vaporization and so cooling down the skin. Now, the nerve fibres that carry temperature sensation are the same type as those that carry pain. If an anaesthetist wants to test his block, he drops ethyl chloride on to his patient's skin: if the patient says that it feels wet, but not cold, that's a fair indication that the nerve block is going to prevent pain.
You may also find it in A&E (ED) where it is used for cryoanalgesia - freezing the skin by applying a succession of drops, allowing each one to evaporate. This isn't much used these days.
If you have ever spilled liquid butane on your hand and watched it boil: that's pretty much how ethyl chloride behaves. Over here it comes in little glass bottles with a spring loaded metal cap over the dropper. I cannot imagine many airlines being happy if they found one in your luggage. It might be easier and safer to apply for a special use licence if that's what your local regulations require. Over on this side of the Atlantic, I think we can buy it without restriction.
Kind wishes,
Nick
