In Canada all milk is so regulated there is hardly a difference buying organic, the biggest difference is the price. Read into it. I always wonder if formula is made from Canadian milk though, the Canadian milk logo is not on the package.
Oh, and I used Loblaws store brand, bought only when on sale.
And about powdered formula, Quebec is warning new parents against using powdered formula below a certain age because of increased levels of bacteria. If you do the math, which i have a few times to convence myself, it is usually cheaper to buy the liquid concentrate, and easier