You may be able to use the 5% off for RAC members code or Quidco, but im not sure.
With the Play.com Secure Digital card you will be able to store more images, ringtones, mp3's and movie clips than ever before.
* Write protect switch (prevents accidental erasure of data)
* For use in SD compliant devices including : Digital cameras, Camcorders, Mobile phones, MP3 players, Navigation Systems, PDAs and Notebooks
* By upgrading your cards you can stores more images, music, movies and data files
* Solid State - No moving parts
* Compliant with the Secure Digital Music Initiative (SDMI)
They also have SanDisk 4GB SD HC Memory Cards for £6.99:http://www.play.com/Electronics/Electronics/4-/4949648/SanDisk-4GB-SD-HC-Memory-Card/Product.html