With a fee - only planner, you'll pay a flat sum for the work that a planner does for you. (newretirement.com)
We all know what a general retainer is: the client pays a flat sum of money to engage the attorney for a period of time, typically for a month. (cosmolex.com)
With this Loss of Use option, Farmers will reimburse you with a flat sum for any travel expenses you incur. (farmers.com)