None, because the lightbulb would have been sold to a customer as part of a premium package already.
[Disclaimer: Somewhat offensive materials largely based on stereotypes, aka pretty accurate]
Now that I have gotten the formality out of the way, here is a compilation of the best cheesy car salesman lines I have heard last weekend when I went car shopping:
“Oh wow, you guys are a really good looking couple!”
“I don’t want to be a cheesy car salesman.”