I did change mine few months ago. I bought my parts from Jenkins for about $240 and I paid about $350 for the labor. I think. I know they guy went higher on me after starting the job. He said "he didn't know" about the frame issue.
And after removing my old clutch I just discovered that I didn't need a new clutch. I guess I'll have to stick with my car for another 100,000 miles
Here is my old clutch. It would last more 50,000 miles with me driving it...
Clutch