In reply to TMM:
you'll be unlikely to see any killer deals on gamma mx hoodies in the uk at the moment...if you can wait, snow and rock usually do a big sale at the end of the summer, with luck and speed you might find the gamma mx is reduced, in your colour and size and you are quick enough to get it...
there is a scandanavian website, something like summitsports.net or some such that does arcteryx stuff, but i don't think its that much cheaper than uk prices...
i guess the other option is that well known auction site