There are a number of rooms and hotels in and around town with prices around 80-120 Euro per night. It is possible to get accommodation down to 40 Euro per night at Ulvön's Youth Hostel!

 

Ljungskile Folkhögskola: http://www.ljungskile.fhsk.se/eng/eng.shtml#Accomodations

Turisthotellet: http://ljungskileturisthotell.se/

Villa Sjötorp: http://www.villasjotorp.se/eng/

Ulvön Youth Hostel: http://ulvon.se/?lang=en

 

Several other options are available. See booking.com, hotels.com or other search sites.