I love my mouse sander

Amongst my more popular tools is my Black & Decker Mouse sander. It fits into the palm of my hand, runs on 120v AC, and hums away like a champ.

In fact, I rarely use any other sander. It has tiny triangle nose, which will get into a lot of areas that are hard to reach. The gel grips make it comfortable to hold for long periods of time.

Home Depot sells off-brand sand papers that fit it, and although they're not the cheapest, they tend to have multiple "noses", so the section that wears away the quickest has the most replacements.