Yeah, Amazon Marketplace or eBay will probably be the best bet. Even though, as stated above, ordering from the US would still be cheaper than the listed price, there's postage of around £4.50 on something even as small as a CD, effectively doubling the price. If a US seller sells on Amazon UK though, postage is the same as if it were posted from within the UK. So, I'll be keeping an eye out.
I've just used the link to let Amazon.co.uk know if we've seen it cheaper. I alerted them to the existence of Amazon.com.
if you can stand to wait, the album and standard shipping will run you £9.63 total which, still pretty expensive for a physical product (as much a part of the desirability of this release as the actual music, iTunes person, is still £6.36 cheaper than buying this edition here.
The extra track is one I, and a lot of others, already have though, as it was featured on the Sin single. I would have much preferred it if they had released Pretty Hate Machine along with a second disc containing the original Purest Feeling demo. At least then you'd have 2 new songs (not counting the instrumental opening), along with alternate takes of 6 of the songs from the actual album. That would at least justify the currently ludicrous price.