Thanks Armaegis and RockJaw. I looked through ebay and Amazon but I couldn't see any deals like the one I linked to. I contacted iheadphones and they said they have the M50s on order so I think I might just be patient.
I had a look at the site you linked to RockJaw but I don't think I'll order from there. I don't really like the look of the site, or the fact that you seem to need to make an account and give credit card details just to look at shipping fees and options. It'd work out around $40 cheaper (with the cheapest, non tracked shipping) but if anything went wrong the hassle and cost of returning something to the US is off-putting, not to mention the wait while it actually gets shipped over here.
Thanks all the same!