The Canadian govt doesn't allow Round-up in concentrate form.....searously.
It a pretty benign herbicide. I can buy roundup, tor-don, heck most anything in concentrate form here as long as i only use it on my own property. I think your going to have to make a trip to the USA and stock up.
I know now in Wash state, you have to sign a log book when buying Hy-Dep, and they limit you to 5 gal concentrate per household per year. So they come to Idaho and buy it in bulk.
Wash state even banned phosphates in laundry soap and dishwasher soap. It took years, but Idaho finally caved into that ripoff also. Now i have a dishwasher that doesn't clean unless they are clean first off (why bother) and dirty clothes. But the farmers can still flood their fields in phosphorous ....... weird how they rationalize their stupid laws.