Zavvi UK
www.zavvi.com
Arrow Video Label Promotion | HMV Store
Arrow Video Label Promotion | Free shipping over £20
store.hmv.com
Just a further FYI - for some reason beyond my comprehension, it looks like they are not offering all the same titles, so if you see one title you want at one store and it's not in the 2 for 15, it's worth checking the other, just in case.