Electric fire spares

[Goochie]

I'm currently working on a little home cinema project in our lounge that will look a little like this:



However, my wofe has decided that she'd like a mock-fire in the gap below the TV, something a little like this:

http://www.homebase.co.uk/webapp/wcs/stores/servle...



Does anyone know where I could find the glowing stone section of that (or something similar)?

I've googled for hours but not found anything.

I doesnt need it to do any heating, it just needs to sit there glowing.