I just bought 100 DVD Rs from target (au). They were on special for $20. I was using DVD RWs for recording tv shows on to, if they developed a scratch then my DVR could stop recording mid program. Also, DVD RWs need to be formatted before they are used, which is also a pain when trying to record a show.
There were also 100 CDs on special for twelve bucks, but I couldn't really justify it since there is only one CD I was thinking of burning, and I have plenty of spare CD Rs.