Bar Harbor has thousands of guest rooms, found in both cookie-cutter motels and Victorian charmers. Reservations are essential in summer; many places have a two-night minimum stay.
You'll find camping in the park; there are also commercial campgrounds along ME 3 near Ellsworth and clustered near the entrances to the park. Numerous 'inexpensive' motels line ME 3 from Ellsworth to Bar Harbor. Summertime room prices start at around $150.