I never looked at the SDS (formerly MSDS) of CD2, but it is classified as toxic, like the other two. Makes international shipping illegal for private parcels. Postal, at least. Commercial is possible, but the shipper needs to be set up for it, and few are. As you say, it costs too much.
Anyway, I'm in luck, Mr Suvatlar has it in stock. 50g units, around €18.50, as the other two. I guess I'll have to get back into my ecn2 process, to make good negatives, which are worth the effort.