The phrase "for a certain sum" is correct and usable in written English.
You can use it when referring to a specific amount of money in a transaction or agreement.
Example: "The painting was sold for a certain sum that was agreed upon by both parties."
Alternatives: "for a specific amount" or "for a fixed price."
You would pay them dollars (or whatever currency) for a certain sum of Liberty Reserves, which they would then deposit into your account.
But in the case of "Chariot" there was no competition: beyond the lot's guarantor — a person or syndicate who promised in advance to buy it for a certain sum — it looked as though there was only one real bidder in the room.
An individual, usually a woman, would fall into a kind of wasting illness, until her relatives agreed to "hire, for a certain sum of money, a band of trumpeters, drummers, and fifers, and buy a quantity of liquor; then all the young men and women of the place assemble at the patient's house," where they dance and generally party for days, invariably effecting a cure.
Santander suspects you were probably promised a certain sum for helping out.
He read in Sylvia Porter's financial column that when she didn't earmark a certain sum for saving in U.S. bonds, it just frittered away in dribs & drabs.
I drew a sketch of the plan and rules that would be necessary, and got a skilful conveyancer, Mr. Charles Brockden, to put the whole in form of articles of agreement to be subscribed, by which each subscriber engag'd to pay a certain sum down for the first purchase of books, and an annual contribution for increasing them.
Of course, you have to leave a certain sum of money for your instructions to be taken seriously.
A bond with a date of maturity usually involves a promise to pay a certain sum each year for a given number of years, and then a larger sum on the terminal date.
The miser imagines there's a certain sum to fill his heart,But for sorrow there's no remedy.It requires what it cannot hope.We've known each other, earth, a long time.
Mr. Sharma will also be given a certain sum, known as "gratuity"— a token of gratitude for decades of service.
In the case of the perpetuity, the undertaking is to pay a certain sum each year or other interval of time for the indefinite future.
