what other websites do you suggest that gives me that price and its real?
Sony MDR-EX500 Appreciation Thread ! - Page 2
Head-Fi's Best Sellers
Well as david said, the seller seems to be quite legit - doubt he would sell fakes - but your warranty won't stand unless his an authorised dealer.
I suggest AMAZON - if you can't go via amazon, and I'm talking amazon themselves - then buy it from that ebay seller :)