If you're a gamer, move along, there's nothing to see here. For everyone else -- particularly those of you who scoff at the high price tags enthusiast grade mice command -- Dell's
new WM311 Wireless Mouse with Nano Receiver might be just what you're looking for. At the very least, it should be within your budget, checking in at only $30 before tax (shipping is free).
The WM311 is a compact rodent best suited for netbooks and laptops, and since you can choose between Obsidian Black, Tomato Red, Alpine White, and Peacock Blue (looks like someone on Dell's marketing team has a future at Crayola if the whole PC thing doesn't work out), you can pick one up that won't clash with your notebook.
Outside of the aesthetics, other features include a 3-button optical design, 1000 DPI tracking, automatic power on/off with indicator light, and a USB mini-receiver with concealed, fold-up storage. What more could you want in an inexpensive, compact notebook mouse?