Camping is available at Hangestian Gotis and especially reserved camps on the main shoreline. Many combine camping spots with domiks and cottages. Costs vary from 2500-5000 AMD per night, can should include public toilet and shower, plus access to the beach and other amenities at the beach site. Free camping is only possible far from the main beaches, south of Gavar and Shorzha on the east and west shores, respectively and along the south shoreline. Traditional spots are going scarce as the lake’s water line rises. Villages are fairly friendly and tolerant of camping, but you should always ask first.
Pensionats are the best deal if you factor in the 3-4 meals a day included in the price. Unfortunately the days of just walking in to get a room are passing; Pensionats were built for factories, unions and governmental associations, allowing locals to have an affordable vacation on the lakeshore. Some allow single night stays but most prefer multi-day visits (3 at a minimum) and must reserve rooms for members of their founding unit. Except for the privatized Blue Sevan on the Northeast Shore, most are run down affairs that spruce up a bit for the summer trade but otherwise are rather dingy with rustic amenities.