I bought the E-3lue Gaming Mouse back in November for $7 because I couldn't believe that it was so cheap and the reviews were so good (4 star average, no over 2,000 reviews).
It is now $13 from Amazon: http://www.amazon.com/gp/product/B005CPGHAA/ref=oh_details_o09_s00_i00?ie=UTF8&psc=1
The gaming mouse has adjustable DPI via a button with up to 1500 DPI. It has 5 other buttons (left, right, scroll button, two side buttons) and requires no drivers. The only issue out of the box is that the side buttons are reversed, so the back button is forward and forward button is back for web browsers and default button configurations (I believe because the forward button is MOUSE4 and the back is MOUSE3). It wasn't a big deal to fix though.
It does have the standard "This is gaming hardware blue lighting" that isn't so bright it is annoying. The performance was good though the wire is fairly cheaply fastened to the front of the mouse, so it could eventually pull out. The length is fairly standard at the just not long enough length.
For $7 it is a steal. However today I am replacing it with the Steel Series Sensei Pro Grade Laser Mouse (http://www.amazon.com/SteelSeries-Sensei-Laser-Gaming-Mouse/dp/B005L38QLQ/ref=sr_1_3?s=electronics&ie=UTF8&qid=1394918284&sr=1-3&keywords=Steel+Series+Sensei+Pro+Grade+Laser+Mouse
A couple of weeks ago, the Cobra started to become noticeably and annoyingly inaccurate. It isn't a big deal with using word processors and the like but in gaming, you can notice it seems that the cross hairs will stop moving for around .5 seconds. The feel of this would be like using printer paper as a mouse pad. Therefore it has to go but for under $15, the mouse was totally worth it and still is.
Lastly, I can put any image I want from a bitmap on the back of the mouse. Is that why I bought it? No. I was actually buying the Steel Series Sensei Raw but grabbed the wrong one by mistake. Oh well.