[emilyfm]

Canada still has pricing to the penny, and if you pay with something electronic (like a card, or online transfer) you still pay the exact amount, to the penny.

It's just cash that gets rounded. This means there is no reason for shops to adjust their pricing for rounding (basically impossible anyway as GST/HST/PST tax is added later) since only a minority pay with cash. It's a good way to avoid any side effects of getting rid of the small coins.