A Great Deal?

The day after the day after Thanksgiving, Lady Nottaguy-TYG and I were at Largest-Retailer-In-The-World-Mart. As we were heading to the checkout, we overheard this conversation between a teenage boy and his dad:

Boy: Wow, Dad. Look at that price. How can you pass that up? That's a great deal!

Dad: For that, a great deal would be free.