This is the best price if you are looking for normal speed San Disk 2GB SD/Mini SD Card. Choose buy used/new and choose amazon.
Play.com seems to have nice deals on san disk and other brands but I specifically wanted a san disk normal speed(seems to work better with zire 31) and I trust amazon buying these kind of things.
It is not less than £15.00 but I was still granted free shipping.
Hope you like it.
Product Description: SanDisk flash memory card - 2 GB - miniSD
Product Type: Flash memory card
Storage Capacity: 2 GB
Form Factor: MiniSD
Supply Voltage: 2.7 - 3.6 V
Included Memory Adapter: MiniSD to SD adapter
Manufacturer Warranty: 5 years warranty