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this ids the cheapest place you'll find:
http://www.unbeatable.co.uk/CatalogueItem_7924.html
i got my MDR-EX71SL's from there, and they're quite effective, though my player is shii-ite with no mega-bass plug.
Try Pricerunner or Kelkoo to find the cheapest on the 'net.
£16.99 with 2.50 P&P; also ordered a earphone extender there.