There are these websites which ten years ago you put in you wanted plane tickets, or a car rental, and they'd check all the options and give you the cheapest. And today the websites still exist but they do something different, which is they let you reserve a plane ticket with no baggage included or a car with no insurance, which means you have to pay for those things at pickup at an unknown rate, so you pick an option $100 cheaper then show up and discover insurance makes it $200 more expensive.