How do I get my mice repaired/refurbished?

I have two - 2x Razer Naga MMOG Laser Gaming Mouse (Model NO. RZ01-0028, Laser Gaming Mouse). They still work for every day computer use, but for gaming, some of the buttons get stuck / don't activate properly. Also the hold down strafing and constant movement that a lot of games require isn't smooth because the left or right mouse click button will start rapidly triggering while being held down or just stop working all together. I realize these are old mice, and they are beyond thier warranty, but I am willing to pay to have them restored. I just don't know where to go or how to go about it. Also, I tried buying the new model Razor Naga Chroma a couple years ago but i just couldn't get used to it. I really love the way the thumb 12 thumb buttons work on the old one. I have also bought some old nagas off of ebay but that isn't going to be sustainable and I have been burnt with bad condition buys before.