I have a
A4tech x 750i and had it for the last 4 years. The first one died on me after 2 years of intense using (I'm on PC almost non stop and I have a 22inch monitor set at 1920 x 1080px) and the second one I'm still using.
It's a laser, gamer mouse and it costs around $30.
I love it!
It's probably not the best out there, but it's very fast (has 5 speeds) and works perfectly.