Geeks cdrs are cheap and cheerful, coming in spindle packs of fifty or a hundred, which are available in most independent computer shops and cost around £6 for 50 and £9 or so for a hundred. You can also buy them on ebay for only a few pounds more. Such a low price would indicate that they may be of less than high quality, but in my experience they are perfectly suitable both for use as data disks and audio cds.
Some audio cdrs are picky about which hifis they will play on, but I have had no such problems with geeks disks, which appear to play perfectly on a wide range of audio systems. Having burned 30 or 40 cds I have only had one failure occur during the burning process (leading to one wasted cdr), and even then it wasn't clear whether this failure was due to the disk itself or to a computer error.
Each disk holds 700mb of data or 60 minutes of audio and is compatible with cdrw drives of upto 52x speeds, and the spindle packs represent excellent value for money overall. The only potential drawback to the cds is ther colour- they come in a bright garish orange that may not be to everybody's taste, but other than that are pretty hard to fault.