by the time you've stuck postage and VAT on - they're well expensive! Any local computer shop (not PC World!!) will have spindles of branded and unbranded CDrs. Last ones i got were 100 unbranded silver 80m CDRs for £13! Try the Computer Store in Birtley or Computer orBit in Low Fell. Or try one of the computer fairs... cheaper still there!
If you live anywhere near consett there £12 for 100 on a spindle, cheapest ive seen anywhere. 20 dvd cases for £4 as well. This is the Computer shop near the Brit, formerly northern electric