Mine have just about met the end of their life.

$99, I think. Though, they did give them to me for $79 by mistake. :-)

Have herd mixed feelings about them, personally think that they work well.<ul><li><a href="http://www.magnecor.com/magnecor1/main.htm">http://www.magnecor.com/magnecor1/main.htm</a</li></ul>