I have been out of the headphone world for a while, so I'm not current on all of the pricing. But I did some research before I listed the HD650s.
According to the Google Products search page, the shipped price for almost all of the stores is $499 or more. J&Rs price with shipping is $512.71. The only two companies that are selling them below $460 (shipped) are electronic stores that are known for shipping grey market products and ripping off their customers. I knew the Cardas cable sold for $222, so I thought my original asking price of $450 for the package was fair.
These headphones are PERFECT, with very little use, and I am the original owner. They look brand new - showing absolutely no signs of wear. If you had a brand new pair to compare them with, you would not be able to tell the difference.
I looked at other 650's that were for sale here - that still had their price posted. Some where second owners, had headbands that had been broken, etc.
I don't know how long they keep feedback on this site, but if it dates back over the last dozen years, you will see that everyone who has ever bought anything from me has been extremely happy with their purchase. I describe everything exactly as it is. (You might want to take a look at my ATH W1000's posting where I note a dimple in the wood the size of a pin point).
Perhaps $350 is high, but I need to get as much as I can to support my family - we are broke. I have listed the headphones at a variety of locations. If they don't sell, I may lower the price.
Also, perhaps I have had too much coffee - I didn't mean for this post to be so long! 
Kevin
Edited by Kevin - 5/20/10 at 5:32pm