Damn, Phenom II. That brings me back five years. As another user mentioned, check craigslist or ebay. I just sold a Phenom II 965 rig a few months ago for about $450 out the door. If I had to part out the PC instead of selling it whole, I probably would have sold the CPU for $50-60.
That's kinda what sucks with me. I have a 965, dont wanna upgrade my mobo because it would cost over $400 between a new mobo, CPU, and new windows. I'd almost consider an X6 if it were cheap enough and it were close to a holiday season where I could afford to put money out for it.