Prices for 939 CPUs will not, or rather should not, be comparable to FX series of CPUs.
Dual Channel controlers aren't a good enough reason to jack prices through the roof since the cost to put them in is negligable at best. They will have half the HT, which reduces size and cost immediately and not by a tiny margin, plus it will also mean higher yields, which just means even more profit.
If anything 939 CPUs will be cheaper, or rather should be cheaper. Unless they significantly outperform current CPUs (highly unlikely) they cannot justify a comparable price point to the FX line.
AMD will have to make a choice if the CPUs are comparable to the current A64 line in performance. Do we pass down the $$$ savings to the customer and undercut Intel yet again, or do we pocket the cash and call it a day.
If they actually hike prices through the roof they are going to loose customers or at the very least delay buyers significantly and by then who knows what could happen. Either way it would be a major "No No" for AMD to pull that stunt. I don't think as a company they could afford to do that. Intel can afford to, but not AMD.