We hit Costco today and one item on the list was compact fluorescent bulbs. To my delight, a 10-pack cost $13.49, with a sign on the shelf indicating it was eligible for a $10 Xcel Energy rebate.
To my greater delight, the $10 rebate was deducted automatically at the register. That brings the cost to $3.49 for 10 bulbs, or $0.35 each. And now we’ve got most of the lights in our house converted!