You'll find em on auto tape, disc players and audio amps...normaly handle 12vdc pwr + & - along with the speaker wires... I get mine from rat shack or from some auto supply stores also from electronic suppy houses..and a lot cheaper than the (ahem) wouldbe failsafe high priced versions of the same old cheapie slides available now a days.

As far as rocker and toggle switches....take one apart and look.. you'll find a small phospher bronze strip that functions like a tetertoter and flipflops back and forth..
Now just heat one up one time..that's all it takes to re-temper the phospher bronze metal to a different shape than the engineer designed it to be.

Instant Failure is Assured!
LOL if your using one of those. If you are then at least get Mil-Spec. quality for goodness sake.