When I was in school, the light switch covers in all our classrooms had magnets on them that fit around the switch and said to turn off the lights when leaving the room. You know, kinda early attempts at saving power, being green, that sort of stuff.
I don't know about magnets. I've only seen stickers.
Do a websearch for "turn off light switch stickers" or "save energy light switch stickers" and you'll find templates so you can print your own, as well as places you can order them. Some will even send out a few stickers for free. None of the ones I found actually fit around the switch, they just go on the switchplate, above the toggle.
I don't know how many you were looking for. Large quantities may be more difficult to find.
Hope this helps.
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