If the North Dakota guy doesn't work out, you can try Canada411.com. Type in Co-op, and it should bring up just about every single Co-op in Saskatchewan. I'm sure you'll find a good used driver at one of those places. You may luck out and find one of the tall units, as some areas did alot of elk fencing a few years back. Also, if PTO power is an option for you, the PTO units sell for a couple thousand less. I personally found the PTO drive units faster. Can't recall if the Honda powered units have the adjusting hitch or not, but that feature is golden.
I've used a Wheatheart, and the community pastures in this area won't buy anything but. The neighbor drove elk posts (10 feet out, 4 feet in) into hard clay land without problems.
Rod