Another City Super just opened up in the new SOGO (which happens to be a 2-minute walk from the old SOGO). This is a fantastic store for imported goods...many of the products come from Hong Kong, and they're not cheap, but you can find just about anything you're looking for.
The best deal in the store (in my opinion) is the CINNAMON LIFE cereal...only NT$135 a box! You can't find cereal that cheap anywhere, especially imported cereal!
City Super also carries a number of cookie mixes, cake mixes, and other "desserts-in-a-bag" that come in handy when you don't have time to make things from scratch.
Craving Cream Soda? City Super sells LIGHT Cream Sodas for only NT$20 a can! Once again, that's quite a bit cheaper than what you'll find in Tianmu. And these things are GOOD!
