We was charged 12 lira each for sunbeds at Indigo Beach club last week. We did not eat there only 2 milk shakes which also cost 12 lira each.
Not sure if you eat there it might be cheaper although we still got charged around 9 lira 2 years ago and we had a meal as well..
Reason I go there is the easy access into the sea. It has a staircase which you can just walk down unlike the usual straight ladder.