£37.95 on Zavvi site, then used the 'ZWalk' promotional code to get £3 discount.
For those who got one of the HUKD Birthday vouchers you can then also apply that. - Got my copy for £32.45 :o)
EDIT: When stacking the discount codes, use the HWalk code first as this applies to orders over £35, then IF YOU HAVE a HUKD Birthday code use that second. (Thanks to various people in the thread for pointing out the need to stack them in order).
(TheHut.com works out slightly cheaper at £34.73 with the HWalk code FOR THOSE WHO DO NOT HAVE A HUKD Zavvi Birthday code)