Amazon has the Lutron Maestro Dimmer Switch on sale for $26.49 with an extra 20% off when buying 2 or more. This comes out to $21.19 each which is a pretty good price for these dimmers and the lowest they have been available on Amazon according the three humped camel. Note the 20% discount is good until May 14th but the price of the dimmer has been fluctuating. It dropped to this price a couple weeks ago and quickly shot back up later that day. So if you are thinking of purchasing it do it now before the price goes back up.

http://smile.amazon.com/Lutron-MA...PDKIKX0DER

Note that these are for single pole of 3 or more way connection (with purchase of an additional companion switch). They are also nice in that you can program them to slowly turn off so for instance you have time to leave the room before they completely shut off. Also the minimum voltage is adjustable so you can tune it to the bulbs that you have.

There are also other Lutron products available with the extra 20% discount. Note this part of the deal has been posted before but I figured it warranted another thread since they dropped the price of the Maestro dimmer.

http://smile.amazon.com/b?node=10...NP43X0DBR2