So what did Canada customs say? 

Dectomax is about the same in price, but Iveron is worth the trip.

We had a 45 minute wait at the border on our last 'Iveron' trip and they held us up researching whether or not fly tags were permitted in Canada. They finally allowed us to take them because they could not find it in their books where they were disallowed, and urged us to get permission from Canada Customs before bringing more tags across. They have a huge selection of different fly tags down there, using differtent chemicals and I must say there are no flies on our calves this summer.

Stuff is so much cheaper down there. If only we could get vaccines.....