Most places are 15tl including the ones along the kordon, Koca Calis ,one of our favourites in Yaniklar and the amazing Toprakana in Ortaca.
There's one in Kica Calis that's 20 but includes fresh juice.
Kargi has always been a bit dearer because everything is home produced and includes never ending fruit juice and as many refills of anything as you want.
Kargi does take some beating although we won't go on principle anymore because of the donkey situation.
17.50 for Calis strip is steep and would have to be better then all the ones mentioned ( apart from Kargi ) to get me in there at that price.