There's a number of posts about ordering from canada, I'd search this forum.

Another option is get a prescription for the older proto-mesalamines. Sulfasalazine is $20.00 a month even without insurance. The older, proto-mesalamines are generic and A LOT cheaper (Sulfasalazine, Colazal/Balsalazide Disodium). These are more complex molecules that gut bacterium cleave into mesalamine and a byproduct. The end result is the same, mesalamine is delivered to the large intestine but through different means. Apriso is mesalamine in a plastic coating, that PH-dissolves once reaching the large intestine.

Sulfasalazine is the cheapest, contains sulfite (an allergen to some). Some experience headaches on it, if you do then switch to the med below. Sulfasalazine is a generic, comes in 500mg pills, a typical dose is 4,000mgs or 8 pills daily.

https://m.goodrx.com/sulfasalazine

Balsalazide Disodium doesn't contain sulfite and does not carry the headache risks of sulfa. Balsalazide Disodium is generic of Colazal, comes in 750mg pills, a typical dose is 6,750mgs or 9 pills daily. https://www.goodrx.com/colazal