Can anyone tell me about CD demagnatizers?

Bedini clarifier works good look around paid $755 new for mine

Bulk tape eraser from Radio Shack works better and cost is about 30 bucks. Hold eraser about 1/4 inch from CD, hit the button and slowly move the CD away from the eraser about 3 feet and you're done. Makes a noticable difference in the sound. Try it, you'll like it!

I have the Bedini Ultra and the RS bulk demag unit, but don't use either on a regular basis. Any improvement is very subtle. The very expensive Furutech unit is supposed to be the best demag available for CDs, Cable Co may let you try one if you are interested. There is a review in Stereophile on the Furutech, also at 6 Moons:

http://www.6moons.com/audioreviews/audioreviews.html

Aluminium foil is the cheapest!! Close to nothing.
Fold a piece big enough to put the CD in between and slide one hand over the foil. It's so simple you won't believe but it really works. The aluminium just takes the static charge away - nothing else do the pricey units.There isn't actually "MAGNETISM" in a plastic disc.....
Good luck - try it - you will like the result!