Tokyu Hands is a one-stop shop for pretty much anything you could want. The one located inside Takashimaya Times Square (located across the bridge from Shinjuku Southern Terrace Exit) has 7 floors packed with household items, travel, stationery, hardware, health/beauty items and souvenirs.
Walk Through Tokyu Hands
If you have never been to a Tokyu Hands and would like to get an idea of what they hold, you can check out this 360° walk through: http://goo.gl/wRtcPv
This walk through is the main floor that usually holds travel items, bicycles and seasonal goods. Sometimes you will also get a chance to enjoy large elaborate displays, like a detailed room display made entirely of corrugated cardboard.