http://www.centarahotelsresorts.com/csb/csb_default.asp#.U4NDfstOXIX
http://www.thecastlerajchiangsan.com/
http://www.sawadee.com/hotel/kohtao/saireehut/
http://saladhut.com/new/Home.html
http://www.citadines.com/en/thailand/bangkok/sukhumvit_8.html
We have booked all of these in advance through either booking.com or sawadee.com or for the Salad Hut we contacted them direct for the best price. The 2 Bangkok hotels are around £60 a night, The Castle in Chiang Mai is £42 approx. and the hotels on the islands are between £55-£60. Most of the hotels include breakfast for 4 people in either large family rooms with 4 beds or 2 bedroom apartments.