I don't know of anything with discounts of the scale of the sites they posted above (although I'd love to), but bookdepository.co.uk sells cheaper than brick and mortar stores tend to, and is cheaper than amazon.co.uk the majority of the time. They send stuff out fast, and shipping is free (however you can't preorder anything as stuff that isn't released yet is just listed as 'unavailable')
Abe Books is really good! You can get new and old stuff for really good prices :)
As far as I'm aware, their shipping costs depend on location, but they're usually a great deal ;) xx
Modified by HerbSynth, 09-09-12, 4:41 AM
"If I don't have to do it, I won't, if I have to do it, make it quick." -Oreki Houtarou, Hyouka.