When we arrived at the store, there were no cars available in the group we had booked. Without asking, they upgraded us to a different model that was in a higher category, and the price doubled. After negotiating, they finally compromised, and we had to choose a model that cost twice as much. They said it was the cheapest model they had available, and there were no other options. Our original estimated cost was $300, but it ended up being over $540. If we hadn't negotiated, the quote they initially gave us was $750, which was really frustrating.