Lightscribe discs cost on average about twice as much as non lightscribe discs, but you may find them for a bit cheaper if you look around.
They don’t really produce very good results either… there’s a pretty wide band around the center hole that can’t be printed on. The background is also dark gold, while the print is black, so it’s black on dark gold, which gives it a pretty limited contrast. Many users complained that the contrast was so bad, that a “contrast utility” was released to try to give better contrast, but even with that tool, the user often has to print to the disc at least twice to get halfway decent results.
In short, you’re better off using a regular printer to print a CD/DVD label.