I was having a look for my friend last night and I found this (forgot to post it). They have a couple for £15.99 on this site, but thought this was the best as its a Sandisk.
With capacities of up to 8GB, SanDisk Standard SD cards give you plenty of room to capture and store all your precious photos, safely and securely. Fast, and built to last, you can count on SanDisk Standard SD cards to be ready when you are, every day.
High transfer rate for fast copying and downloading
Large storage capacity, up to 8GB
Built to last, with an operating shock rating of 2,000Gs, equivalent to a ten-foot drop.