Have you noticed that soda is much more expensive in the restaurant? It is one way of saving when you buy soda in the convenience store before going to the restaurant. In the Taoyuan airport in Taiwan on our way home, we dined in the food court. The Coke costs 40 NT$. It’s good that I had noticed a vendo machine nearby selling the same Coke for only 20 NT$. You can guess that I went to the vendo machine.