I hope you have had other advice now! but just in case you are still on the look out then then this is an excellent deal for a good camera. However it is still nearly £70 which might not be really cheap!
http://www.amazon.co.uk/Sony-Cyber-...?ie=UTF8&s=electronics&qid=1223551082&sr=1-11
Below that price I would recommend you consider a good quality second hand camera unless you are set on new. I used to have a 4 megapixel Kodak camera that took amazing photos, much better than a lot of 8+ MP cameras can achieve because the lens was top quality, I actually sold that camera on ebay for £50. Megapixel count is not that important, despite what some electronics shops might have you believe! Argos have some decent cameras for under £50 pounds new, might be worth checking them out. If you want any advice on any particular camera model than I would be more than happy to help you out
I am a bit of a camera nerd!