Cinnamon Chip Scones

all purpose flour 1/3 cup + 2 tbsp sugar, divided 2-1/2 tsp baking powder 1/2 tsp baking soda 1/2 tsp salt 3/4 cup cold butter, cubed 1 cup buttermilk 1, 10-oz package cinnamon chips 2 tbsp butter, melted