Also know that a short “ish” drive to the Mexican border and you can purchase your insulin for the same price or less than the over the counter price in Canada if you want to stay on Lantus.
See this thread for more info, including current prices:
You say that Lantus isn’t on the formulary, what is on the formulary? Is just NPH? Do you have a copy. There are currently a pretty good list of possible basal insulins out there.