The singing bowls we came across in Khao Lak were between £10 and £120 depending on size and quality. My friend purchased 2 14cm ones and paid approx £70 each for hers but they were quality bowls. A few shops on the main road have them, but she got hers from a little place in the night market. Shop around and bargain as they happily offered discounts without asking.
There is a weekly local market outside the boxing stadium, not sure what day it's on,. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Fyl0sCw2y3k.htmlsi=HLAorXi1nltvmDIw