Stay away from the Memorex CD-RWs. They are bad quality (made by Infodisc). I don't have any results from their 24x discs, but their 4x and 12x discs are awful products that don't last more than a few burns:
http://www.cdrlabs.com/phpBB/viewtopic. ... 9476#49476
On the other hand, people have reported good success with the Verbatim 24x CD-RW media. You can find it for sale all over the place. Just do a search on Google:
5 pack - Verbatim 94458
10 pack - Verbatim 94457
Try those in your favorite comparison shopping engine as well (pricegrabber, bizrate, dealtime, etc.).