Gold Beach guesthouse is also around the 1,000 — 1,200 Baht / night mark in High Season and a couple of hundred metres away Baan Sai Kao has good value rooms in the 1500 — 1800 Baht / night range during High Season (iamkohchang.com)
There isn't a large choice of budget accommodation but you'll find a friendly welcome and good value rooms at small resorts and guesthouses such as Thaidaho Vista or Koh Mak Holiday bungalows. (koh-mak.com)
We are not able to suggest specific hotels for you to stay in but there are many good value rooms available via AirBnB. (schoolofbabywearing.com)