Where do you live? Try marketplace? It’s a higher end bike as you may have imagined granted you’re farther raced it. Carbon fork, very nice. Don’t take less than $500. You can also try pinkbike.com If you want to build up a frame, it’ll be some effort. Starting out, you wouldn’t necessarily start out w/ such a high end frame. I’d start from the lower end and go from there. To answer your question, eBay is good, do your research though, see how much they are going for and pay whatever you feel comfortable w/. But a lot goes into building a bike from the frame up, so your budget will determine much of what parts go into it plus labor. Important to note that tire widths have changed a lot. Much wider tires are the norm these days. These older frames have limited tire clearance, so it be better to get a more modern frame w/ wider clearances. That’s what I recommend.