Sainsburys are currently running a price reduction on certain computer consumables and peripherals IN STORE - best deal appears to be 100 Verbatim CD-R Extra protection blank CD's at £9.99. Very good brand and of the 100 I bought there have been no coasters so far (unlike supermarket own-brand from Asda and Tescos which were crap).
The "extra protection" bit is an "extra protection durability layer" - whatever that means!! Oh, and they are for use in 52x speed CD-R/RW drives. 700MB capacity 80 min.
So pop down to your nearest Sainsbury's for a bargain!