If it is the inside switch (meaning it hasn't been exposed to the weather), you should have good luck giving it a shot of electrical contact cleaner. This stuff cleans oxidation off the contacts, and also has some kind of a lubricating base, both of which would do you some good. A spray can of this stuff probably costs about the same as a new switch, but it has other uses (think the Bargman connector between the TM and car).
You could also try a shot of some thin oil into a crevice in the switch. It won't clean the contacts, but might free up the moving parts. I suggest you do not use WD-40, which leaves a gummy residue when it dries.
You might find a replacement switch at Radio Shack, if you still have one operating in your area. Or order it. Since this is a 12-volt circuit, a switch rated either 12 volts or 120 volts will work.
Check hardware stores, lamp stores, etc. Aside from size, there is absolutely nothing special about this switch. It is a common generic.
Bill
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