I can't believe they're still there 3 1/2 hours after your post. I looked all over when I bought mine recently (at list price) and could find absolutely no discounts / returns / B-stock anywhere. This is the finest headphone I've ever heard, better than my Beyer T1 IMO .... If your budget can swing it, I would run, not walk and grab one before they're gone.
really, i got a chance to compare them with my hd 600 today, and i prefered the 600. the 500 just didnt have the extension in the highs for me. I guess i just dont like warmth...meh