Marc,
i'm not entirely sure if this price is possible as i haven't ordered yet but i'll try and explain anyway.
firstly i looked through all (2!) uk retailers and found them to be around £120, then looked at some eu retailers to try and avoid customs and noticed that whilst cheaper by the time you added on shipping it wouldn't be worthwhile (ie saving of £5 or something).
So i began to look at US sites, given still the relative strength of the pound over the dollar. by chance i clicked on
http://www.discount-electronic.com - the standard er6s were $20 cheaper than on the official site and elsewhere that id looked but also i noticed when searching that sets came up for $98...
Some quick maths will tell you that is about £60 and they offer flat rate shipping internationally for $10 it seems (which i was surprised about). Then even at worse customs can't charge you more than £15-20 so i think £80 is poss the worst it could come out at..
anyway, quickly clicked on the link to find that these were 'for nextag customers only', not discouraged i googled nextag and found it to be what looks nothing more than a US version of kelkoo and there doesnt seem to be any sort of user login..
as of yet i havent proceeded further yet as having read a few reviews on audioreview.com there are a few people saying that they are excellent but also a similar if not greater number either saying that they arent worth the money due to no bass (though this might be caused by their inability to get a good seal) and/or the fact that despite being half the price, they are still vastly inferior to the er4s.
hmm this reply is getting a bit long now

...i would have ordered them this w/end had it not been for audioreview although words from alexs2 help boost my confidence.. was secretly hoping for other people to come forward and get some more opinions from people i 'know' (in a weird internet forum sort of way :P)