It is possible that the company or service you are referring to is either new or operates in a limited region or industry that I may not have information about. To obtain accurate and up-to-date information about the charges associated with Flex Rent or any other rental service, I recommend visiting the company's official website or contacting their customer support directly. They should be able to provide you with detailed information regarding their pricing structure and any additional fees or charges that may apply to their services.