Maplin have got this deal online and in store as well.
Works out to be 80pence a disk, which isnt bad for these disks!
Had saw them in store yesterday, but apologies if this is a duplicate post if someone already else found the deal!
edit. the go to deal link isnt working. Takes you to batteries.
Here is the correct link - http://www.maplin.co.uk/Module.aspx?ModuleNo=344836