Play.com have a Play.com branded 2GB Micro SD card, with adapaters that allow it to be used as a Mini SD or normal SD card! Great if you have multiple devices with these different formats. It's priced at £5.49, with free postage. If you wish, you can purhcase via QuidCo.com for 4% in cashback.
There's a list of mobile phones it's compatible with on their website, although it's not limited to just phones and will indeed work with any device that accepts these sizes of card (for example, many cameras use an SD card).