Passports would be a very good example of a revolving fund that is on full cost recovery. Whatever their full costs are, they are expected to recover those full costs through the price charged for a passport.
I'm trying to think of another example, and one is just not coming to mind at the moment.
Funding is a separate issue altogether. You can estimate that something is going to cost something, but if the funding is not forthcoming, then you're going to have to reassess what it is you plan to do.