Some of us have the advantage of dealing with the same rental company for many years. One of the reasons we stay with them is that they don't play games to appear to be the cheapest.
I've paid the same rate for the past 5 years. When a car rental agent for a new company at our hotel asked what I paid for my rental, I told him and he responded by stating that I could only get that price if I had rented from same company for many years, which I have for about 15 years.
Flat rate for High Season per week/10% tax/ liability and additional drivers included.