Datawrite 2GB SD Card (Hi-Speed) is just £17.69 delivered from Amazon.co.uk
Cheapest price (probably) for a 2GB SD card :)
About: The SD Memory Card is a groundbreaking bridge media that's helping to pave the way for tomorrow's fully networked society. This tiny, easy-to-use card offers a host of powerful advantages. It links various kinds of digital equipment through its easy connectivity, that supports a host of application formats and does not require the use of a PC. Further, the SD Memory card has the broad interoperability and compatibility needed to ensure that its applications will continue to expand far into the future.