Best Buy offers the Logitech G402 Hyperion Fury FPS Gaming Mouse for $19.99 with free shipping. That's tied with last November's mention and is the lowest price we've ever seen. (It's the best deal we could find today by $15.) It features four on-the-fly DPI settings (up to 4,000 DPI) and eight programmable buttons.
There are many ways to get cheap and even free services and goods after reaching a certain age.