7-11

Site: http://www.7-11.com.tw/ (English Version: http://www.7-11.com.tw/en/index.htm)
Phone: 886-2-27478711
Address: There are 7-11's everywhere
Price: Varies
Time: 24/7

The most convenient thing about 7-11's are that they are open 24 hours every day. If you need something at 3AM, they will be there and they will probably have it. The prices are pretty reasonable and I go here almost every day just to pick up something or other. There are also hot foods!