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It depends on what the problem is. New lock switches are about $45, or Pep Boys has generic ones for $19.95. The plug that goes on the back of the switch is about $12 from Ecklers, etc.
And remember, if one lock switch is bad, the other won't work either.
What problem are you having??
First thing to check is if any of the wires came off the plug connector on the back of the switch. This is pretty common as the wires get a little brittle. If this is all it is, then it's just a matter of reconnecting the wires...or buying the rebuild harness for $12.
When I got my car neither of the power locks worked. When I flipped the switch I would hear a noise, but nothing would move...
I took the door panel off and sprayed every joint I could see with carb cleaner, then a WD-40 like lubricant and then a silicone spray. I also made sure to get a bunch of the lubricant down into the door lock actuator.