The price list
Every package has a price range, and your proposal names a single figure inside it before any work begins. The list sets out all of them: the seven packages, the ongoing work, and the smaller pieces clients most often ask for on their own, each with what it includes and how long it takes.
It comes by email, along with a subscription to Notes from the Margin — that is the trade. Tell me where to send it and it will arrive in a minute or two.