I've been looking for a new keyboard, and to make my life easy I made a script that goes out and finds them for me across all Craigslists. Actually, I just started with Korg, but was asked to add more. I figure I'd post it here as it might help you find what you are looking for:
http://www.jaxed.com/cgi-bin/merch.cgi?itm=alesis http://www.jaxed.com/cgi-bin/merch.cgi?itm=korg http://www.jaxed.com/cgi-bin/merch.cgi?itm=roland http://www.jaxed.com/cgi-bin/merch.cgi?itm=yamaha

Let me know if I should add more!