Shure's for £49.99 > hxxp://www.mobilefun.co.uk/product/7349.htm (dunno if I can link on here). That's cheaper than any I could find elsewhere. Cant vouch for the site though.
I'm thinking about buying some but am put off because I seems to trash headphones quite quicky... even though I'm careful! that's a lot of money to waste.
I've been through 3 sets of Sony MDR-EX71's in the past 18 months.... to the grand total of £75 (£25 from amazon, £35 from Dixons!). The sound quality and fit are both superb however the rubber on the earphone that goes round your neck always seems to degrade and expose the wires. So now I have 1 white set and 2 black sets, all with exposed wire! I tried to fix one set with some heatshrink but I didnt work.
I dont like the supplied headphones that came with my iAudio X5L so I'm currently using Logitech Playgear Stealth headphones but to be honest they're pish... I bought them for my PSP and soon realised the error of my ways... they have no bass what so ever and for an in ear type headphone they dont fit very well at all.
If only Sony MDR-EX71s were better made...