'come at a fee' is correct and usable in written English.
You can use it when you want to suggest that something will require payment. For example: "These services come at a fee, so please make sure you bring enough money with you."
The Twitter API is offered for free, but the Twitter firehose, which removes a lot of the usage restrictions imposed by Twitter, comes at a fee that not all researchers could afford.
With that kind of gesture, and with support from the community, I was happy to come at a reduced fee ($1500 for two days).
But this convenience and miles does come at a cost in processing fees.
The exorbitant salaries for top management, with their generous perks and multiple raises, have come at a time when student fees and tuition have skyrocketed and many students cannot graduate in a timely manner because so many courses have been cut and the budget for basic instruction has been slashed.
Such contracts are common in federal disaster planning protocols, although they often come at a price as companies charge a fee to reserve generators or other gear.
The higher fees come at a time of stepped-up security, when carry-on luggage is undergoing a second and sometimes a third bag check.
While FIFA, soccer's world governing body, did not release the bid figures, the record rights fees come at a heady time for the sport in the United States.
Additional duties typically come at a direct financial cost to fee-for-service practitioners.
Any additional duties typically come at a direct financial cost to fee-for-service practitioners or need to be compensated for within the IHC model.
That luxury comes at a fancy fee, of course.
