My wife and I would love for me to get a vasectomy, but I don't have health insurance and we lack the disposable income to pay for the procedure. Any advice?

I'm 26, married, and uninsured. My wife and I have no interest in ever having children, and when we got married I decided to start looking into getting a vasectomy, but since I haven't had health insurance since I was a kid I would have to pay for the procedure out-of-pocket. I've heard people tell me that some doctors will do procedures like that for a reduced rate (or, better yet, pro bono), but all of the places I've called in my area tell me it would be upwards of $300. And it would be nice to have the procedure done, but I can't afford to spend that much on something non-essential right now.

So, does anyone have any advice? Has anyone been in a similar situation? For what it's worth, I live in Tennessee (just South of Nashville) in case anyone happens to know anything about the area.

Any advice would be most appreciated!