Deer Isle vacation rentals are C$ 443/night on average. However, you may find that prices fluctuate depending on the time of year. For example, August is the most expensive month to book a vacation rental in Deer Isle, and October is often the cheapest month to book. Recently, our users found rentals for C$ 397/night - which is currently the cheapest price. Keep in mind that anything C$ 443/night or less is still considered a good deal.