No need to spend $100 on an ExpoDisc, a pack of coffee filters is less than $1!

No kidding, I read about this on dvinfo somwhere I believe where some of you are using white coffee filters to white balance just like the ExpoDisc. I've tried this too and it seems to work very well, especially when you have different colored light sources.

Just take one or two *white* round coffee filters (not the brown or recycled ones, just the cheap-o pack of 500 that costs about $0.80), put one or two of them in front of your lens, set to manual focus, point towards the light and white balance. This works suprisingly well!

I know there are differences in color and whatnot for the coffee filters, but for a quick and dirty easy white balance it works great... and cheap too

Using the disk like an incident light-meter, you don't have to put the camera where the subject will be. More important is that the light falling on the meter is the same as the light falling on the subject, so in most cases you just turn round 180 degrees and take the reading.