Could you order the Acana online? It will cost you for shipping but to me it would be the safer choice if you are worried about the Ethoxyquin in totw. I just started being able to get the Acana around here, I had to order it online. It would cost me around 20ish dollars for the smaller bag and shipping. Expensive, but worth it. A 5 pound bag generally last me 4 to 6 weeks, feeding my 2 smaller dogs.. 4 and 9 pounds. It is still hard to come by on certain websites.
. The company really needs to pick up production..
Or you could do as viviansnickers suggested, just keep them on the orijen until the Acana comes in. It wont hurt them for them to be on it a little bit longer.