I don't like this ultra-short edit period! I want to EDIT my post, not make a reply 5 minutes later...

Electricity here is seasonal, but averages about 6 cents a kwh. Each amp of continuous 120V works out to a little over $5/month. 15A space heater in a poorly insulated area? $80/month. It's funny- a typical CFL will literally pay for itself in a month.