RJ Cooper has a fun little project to make your own switches for various devices. Since large switches can get pretty expensive, this method to make one for $10 looks pretty interesting. I've built quite a few varied switches using door bell switches and others from Radio Shack and this one looks very workable and has its own charm.
I would be interested in hearing from someone who uses them how well they work and if they wear out. They look like they aren't for a very light touch but could take some abuse. There's a video on this page that shows a bit how they are put together.Assistive Technology - Switch-Kit CD Switch