Robot electronics

Would any of you good fellows know where to get affordable robot controllers/interface/relays/speed controllers for leisure. Not for school but for personal interests. I am sure many Robot-Hobbyists would like to know and links would be helpful. Thanks in advance.

you can visit http://robotroom.com the guy who runs it has written 2 books on robotics, and it could be a great place for a hobbyist to start.