Buying on line can be very risky, The customs will stop the package destroy it and send you a warning letter. After which you will be on the "watch list" and all your shipments of items even from USA will be delayed and Inspected. The Canadian Government want their Taxes.
In Quebec you may go in a walk-in clinic for any health concern. If you are not covered by province health insurance, no problem, you will have to pay for the consultation (around $100 I bet). After a few questions if you don't have adverse conditions you may get a prescription good for 2 years, and then get your prescription filled in any drugstore. Cialis is roughly $20 a 20mg pill but it is active for at least 36 hours so it's called the week-end pill. Canadian customs are very effective in intercepting products from outside Canada as it is illegal to import drugs even those legal in Canada (Viagra, cialis, etc. ). Someone posted that the patent for Cialis is ending in 2017 in Canada. Hopefully the price should then go down.