For the past 4 years, I have been doing Alodine demonstrations at the Sheet Metal Workshop at Sun N' Fun. This year, I accidently left my powdered Iridite 14-2 (competitor to Alodine) at home. After several panic phone calls, I learned that the auto paint store in Lakeland carried liquid and powdered Alodine.
I purchased two 4oz containers of the powdered version. The manufacturer is Canadian. They have distributers across Canada and in 4 states here in the USA. For more info go to:
http://www.endura.ca/adobe/canadalist.pdf
http://www.endura.ca/adobe/uslist.pdf
You might want to check out your local auto paint stores before making things harder than need be.
FYI, Endura does not list Alodine 1200 as a product on their web site, but they do manufacture and distribute it.
Regarding comments regarding storing powdered Alodine, I still have 2 pounds which I've stored for over 5 years. I just mixed some of it up last month and it's still good. Keep it inside 2 zip lock bags, one inside the other. It will be just fine. I live in SE Florida. There aren't many places on earth that are hotter and more humid than here.
Charlie Kuss