Truth of the matter is that by buying them for 5k down there, getting them transported across the border and to your place.(if it's not a driver) and then getting it all up to snuff to pass Inspection you are spending upwards of another 1-2k right there.
The vehicles from the dryer climates will have must less rust, will not have been exposed to salt, and if the right one comes along well worth the extra effort to bring it up from it's slumber in a barn...
What people forget is that although they were exposed to all 4 seasons cars from AB, and Sask are usually less rusty simply due to the dry climate of the praires. That and sheer numbers sold. I'd look around the prairie sites and see if anything is available first. You'll still need an out of province inspection but won't have the hassle of shipping companies and border.
Ya get what ya pay for BOTTOM LINE. (but there are still finds out there, ya just ain't gonna find them online)