If you shop around, you can probably find that Northstar cheaper, but not by much.
If want an AGM, but don't want to spend 500 dollars for a Northstar, Deka has another option. Their 9A31 has 925 cca's, and 190 RC, which, although shy of the suggested 1000, should still give you good service for a few years. 290 CAD at Great Northern Battery in Hamilton, close to you.
If you are willing to use a wet commercial battery like many do, including me, then Deka makes a 1231 MF with 1000 cca's and 185 minutes. Great Northern Battery has a load of blemished 1231's, at 80 CAD. That's a crazy deal, when most of the Deka commercial batteries like that one are around 225 CAD at NAPA Canada. If I had to replace my commercial battery right now, I would be heading down for one of those. There are arguments for and against using the commercial/truck batteries in a bass boat, but twice now they have lasted at least three years in my boats.
In any case, Great Northern Battery carries most of the name brands at good prices, and they are not far from you.
905 549 4454.
Hope that helps. BTW, that Lund is a sweet rig.