CdR's should be a bit cheaper in my opinion - £7 that someone mentioned seems good.

Failure rates also vary with whick make of blanks you use.

Taiyo Yuden CD's originals are what nearly all professional plants will be using - there failure rate is much lower and they are more expensive to buy; not a problem considering the printable ones work out at between 25 and 48p each depending on which finish you go for. Make sure you get genuine Taiyo's though

This lot sell genuine ones
SVP Taiyo and others