My recollection was they are in the $150 range for the set in good condition without any issues. Others may have more accurate pricing.
I believe you're thinking of the standard SR-5. I'm asking about the SR-5NB, or the 'goldies'. I've been checking ebay as well as head-fi every month for the past year or so(hoping to find a broken pair so I could scrounge a new headband) but only one has come up since I bought mine. And like the pair I bought the seller wanted $350 and it sold. His was in mint condition though.