Recently had wonderful remote controls by Harbor Breeze installed. Model # RCB-103L.
However, require very small 12v battery, looks like a AAA battery but about half the length and high voltage.

MSC Item Detail

Or

Digi-Key - N403-ND (Manufacturer - A23CVP)

You could have an MSC office nearby. If you order in person, you don't pay postage.

Or locally at at a Radio Shack

http://www.radioshack.com/search/ind...rigkw=a23&sr=1