I think this might be the cheapest I have seen for a 4GB SD card - if anyone spots a cheaper one, please let me know. With the increases in megapixels in your digital cameras, the smaller cards can get filled up quite fast, especially if you have a 6mp or 7mp+ camera. This is 4GB all in one go - great also if you like taking videos with your digital camera.
The price is £45.94 including delivery from 7dayshop. I've bought from these guys before and have had no problems.