This is a strange one: you can currently buy the Canon EOS 500D lens kit (with the 18-55mm lens) for less than the 500D body at Warehouse Express. The lens kit is £695 wherease the body only 500D is £719. This values the EF-S 18-55mm IS lens at -£24, even though they sell the lens on its own for £143.
Now, the body only option comes with a free card and bag, but you have to wonder just how “free” these items really are?