My guess on pricing is that they will come down in about 5 to 6 months. This is a completely new chip...and is in many ways a new architecture even. So production costs are currently sky high. Also there are only 3 chips out right now (i think 3..could be 2 or 4). in any case there are very few chips out, so basically prices will come down when they release more chips. A bit of advice...don't buy an FX. This was a bad move (IMO) on AMD's part. It is simply a rebadged opteron, running on the 940 pin spec. It's a good chip actually...but they are planning on releasing a new 936 pin FX in the next year...so boards and support for this current version of the FX is going to be very shortlived.
Also prices should come down considerably when they get their .09 production process out. I read somewhere that their sweet spot (considering their production techniques and wafer sizes) is around 90-120nm for a die. The current 64's are around 180nm. so when the smaller production size comes out (along with procs with less cache) the die will shrink considerably getting them back in there sweet spot.
So my guess is around 6 months (maybe longer depending on how long it takes them to stablize the .09 process)
EDIT: if you're going to get one now...get the athlon64 3200+
EDIT: found the link:
http://www.anandtech.com/cpu/showdoc.html?i=1884
also take note of the linux tests they did. These are 64-bit apps running on a 64-bit OS. this is a sign of what this proc can do in the future.