Geoff,
I buy 6 or 12 cans at a time (a box/case worth) on Ebay (vendors out of Japan or China/Taiwan)...takes about 15 to 30 days....or if in a hurry I will buy individual cans at one of the LHS that carries it (Pegasus Hobbies, Brookhurst Hobbies, Warbird Hobbies), or my other frequent source is
greatmodels.com online (which was just recently acquired by Sprue Brothers
http://spruebrothers.com/ .....have not dealt with the new ownership..so don't know if they carry it, or what their service is like)
Marc