In Taiwan you can buy transportation card in every 711 convenient shop . It offers discount in public transportation vehicles like buses and subways, and also is handy when buying snacks and bottle water. The card is well-designed with artisitic decorations.
In Taiwan, if you would like to buy snacks, I would recommend 711 convenient store. They also offers public transportation card which will surely be handy when you getting around the island. If you would like to buy skincare stuff, then cosmed may be a better choice.