Are you looking at buying one or making one? If you want to make one here are some basic circuits you could make up quite easily for bugger all money:
http://www.qsl.net/yo5ofh/hobby%20ci...d_circuits.htm
If that's no good, let me know what you are trying to achieve and chances are I probably have something here or could make something up.
Edit: (Or is it an LED chaser you are looking for? Try searching for that instead and you may have more luck)