Been using some Sennheiser MM50iP headphone for the last 5/6 months and thought they were ace until last night when I realised the human voice range is no longer audiable, can hear the music but the voices are just muffled (fine with other headphones).

So though I've emailed the original sellers, I'd like to replace them a.s.a.p (if I end up with spares the g/f can have em), happy enough with the MM50iP but would like to get em cheaper.. google suggests a number of sites I've never heard of (A1 Discounts/iAural/PC TV HiFi), so anyone got the quickly and cheaply from anywhere?
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I used Amazon previously (£30) and will go back there is nothing else is forth coming.
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By all means suggest other cheaper headphones as long as they fit in-ear and have a mic to use with the iphone