Depends really. The prices on these opti's are really erratic these days.
Here's what MrMojoz found a page or two back;
Quote Originally Posted by MrMojoZ View Post
http://cgi.ebay.com/AMD-Third-Genera...ht_1157wt_1137

8347s 5 at $30.

http://cgi.ebay.com/AMD-Opteron-8350...ht_1161wt_1137

8350s 10+ at $40.

http://cgi.ebay.com/AMD-Opteron-QC-8...ht_1137wt_1137

8356s 10+ at $50.
A quick look on ebay for 8350's;

$65.00 free shipping
http://cgi.ebay.com/AMD-Third-Genera...item4151ffb6ba

$80.00 $7.00 shipping
http://cgi.ebay.com/AMD-Opteron-8350...item2a087a69c8

But just look at this search for some really ridiculous prices

http://shop.ebay.com/i.html?_nkw=amd....c0.m270.l1313