it's right in the middle of the page: April 19 Only -
Earth Day 1 Million CFL Light Bulb Giveaway
The Home Depot will be giving away 1 million CFL bulbs in support of our environment on Earth Day 2009. Receive a free EcoSmart 14w CFL bulb from participating The Home Depot stores on April 19, 2009. Quantities may vary by store. Limit one per customer while quantities last. No purchase necessary. Offer cannot be combined with any other promotional offer or discount. No credit if offer refused.
I got both Sunday. Different stores had different days through today they were participating. These CFLs really help! Home Depot also has a bin to place these for recycling should one go out. They're supposed to last for years.