Spotted these this morning in HMV Belfast City Centre (had 2 pairs left on rack) marked down from £99.99 to £59.99 and now £35. Didn't see them online and possibly store specific but potentially worth a look. Get reasonable enough reviews just kinda on the big side!! RRP allegedly £90/£100 but available from Amazon and Play.com for £59.99
Sony MDRXB700 Giant Extra Bass Headphones with Extra Large 50mm Driver Unit
"Step up to Sony's long-awaited, high-end MDR-XB700 extra bass headphones. Engineered with an oxygen-free copper (OFC) voice coil for clear sound with no degradation, this bad boy was destined for handling high power. You will also appreciate the circum-aural, closed-design ear cushions, padded headband and of course the enormous 50mm extra bass diaphragm driver units. Includes a carrying pouch to protect your investment."