*Semi-Official*
Link

Quote: AMD’s two-way capable quad-core Opteron 2300 series launch with five new models – 2350, 2347, 2347 HE, 2346 HE and 2344 HE. Pricing for the two-way capable models start at around $206 and go up as high as $372. Quad-core Opteron 2300 HE models command an approximate $60 premium over standard models, clock for clock. On the multi-way side of things, AMD has four quad-core Opteron 8300 models ready for launch – the 8350, 8347, 8347 HE and 8346 HE. The multi-way models have a $688 cost-of-entry and top out at around $1,000. Unlike the Opteron 2300 series, the 8300 series HE models command an approximate $110 price premium. Expect AMD to launch its new Barcelona quad-core Opteron 8300 and 2300 processors later this month for server and workstation markets. Desktop users will have to wait until Q4’07 for AMD’s Phenom to experience quad-core.

Charts wouldn't copy correctly for some reason so you'll have to follow the link to see the full pricing list. I believe that the NDA is supposed to be lifted this Monday so hopefully we'll see official benchmarks of it.