CFE, or Comision Federal Electrico, or simply Comision, how ever you choose to call it is having a promotion to help save energy and earth resources.
I don't know if this is countrywide, but I do know it is happening here in Merida.
You take up to 4 of your old incandescent bulbs, your CFE bill, and your official id. Turn in your 4 bulbs, and get 4 energy saving spirals.
Now that's a promotion I can take a shine to!
You can make these exchanges at Chedraui, Coppel, or Soriana.