Home Depot - Get up to 2 Free Select Power Tools with select Kit Purchase

It's not that the 3rd tool is free, but all the tools of your selection will be at a discount price. As a result, the final price will be equivalent to as if the kit is at original price, but the 3rd tool is free. In other words, if you return the kit, you won't get back what you paid. But still the discount is not bad.