Yes, and Canadian Tire doesn't even carry it anymore. The last I saw on the shelf was Texaco stuff at Partsource. Perhaps a Partsource in your neck of the woods may still have it. I don't think even Rechochem is making original green these days, and they make up whatever a company wants, plus a bunch of jobber stuff.
The other option would be a Chevron lubricant distributor (Husky/Mohawk handles that out west), if you can find one, since there still is a Havoline branded conventional green listed on the Chevron site. I can't say for out there, but here, a number of trucking outfits carry a lot of Chevron products, and one may be able to do a special order. Given the coolant capacity of vehicles like yours, it's probably not outrageous to buy a box of four jugs.