Here are a list of links to switches that should work:
I would recommend Mouser for all your electronics needs:
Mouser Part #:633-S3F this is a standard toggle switch
Mouser Part #:633-M201301-RO this is a mini toggle switch
Mouser Part #:540-SRJ24A3HBBNN this is a 1 inch diameter round rocker
RadioShack: (if you have to use them)
Model: 275-654
The 2 below are double pole, so there are 6 terminals not just 3, use one side.
They will work, but if this confuses you, just use a single pole switch above.
Model: 275-1533
Model: 275-653