A 12 oz can of the 409B is listed on Amazon-UK for 17 GBP.
Think my last can (California) was $14-$15 including tax.
I have a local shop that carries it, along with the Caig products et cetera.
Nothing wrong with Caig cleaner, other than that for my usage I then have to clean it off with another product.
All I want is a clean connection sans residue, especially in regard to tube pins and sockets.