Fuji 1GB XD Card (Type M) is £18.99 inc Free delivery from Amazon.co.uk
Good price for a Type M XD card. Compatible with Fuji, Olympus and all XD card enabled devices, Type M card was released in late 2005 and uses Multi Level Cell (MLC) architecture to achieve higher storage capacities. There seem to be some compatibility issues with older version of Olympus cameras for video recording.
Prices at other sites are Jessops - £54.99, Picstop - £30.80 and £25+ in ebay
Thanks to omair for the pointer in MSE.