Rockler safety switch is on sale http://www.rockler.com/safety-power-tool-switch 29.99
In case you are wondering the switch is double pole internally rated at 18A 125 volts and 10A 250 volts. I couldn't find a UL marking anywhere but reviews have been favorable on Rockler's website. The paddle tends to pop off easily but pops right back on. That is to say, placement is important; out of the way of accidental bumps, but easily accessible to bump with your knee or hand.
In case you are wondering the switch is double pole internally rated at 18A 125 volts and 10A 250 volts. I couldn't find a UL marking anywhere but reviews have been favorable on Rockler's website. The paddle tends to pop off easily but pops right back on. That is to say, placement is important; out of the way of accidental bumps, but easily accessible to bump with your knee or hand.