Cheap Memory How Do You Put A 512 Memory Card In K610i? Also Where Can I Buy A Cheap One?

How do you put a 512 memory card in k610i? Also where can i buy a cheap one? - cheap memory

need at a price of 512 MB memory card for K610i on £ 15 / £ 16 including shipping. Please no eBay or Amazon .. so if I do .. How can I save on my phone? Thank you very much