I was down at dickies in walden galleria and there was a 22 break open pellet gun.1200 fps for 60 $. The thought did cross my mind not worth the risk though to save a few hundred.
In the US airguns are not considered firearms at all so it is not restricted for export under ITAR. You could have legally bought that air gun in the US, legally exported it out of the US, claimed it at the Canadian border, and then shown your PAL to the nice people at CBSA since a 1200 fps air rifles is a firearm here in Canada.