Русско-англо-русский юридический словарь

Price sanctions are used when the parties agree on them. They are also permissible in place of mandatory penalty for breach of contract. The amount is, likewise, to be fixed by the parties (Contract Law § 53). If they do not agree on the amount, then a half of the statutory penalty for the same breach of contract is the amount to be charged. (International Encyclopedia of Comparative Law, Volume 13, Part 1, by Michael A. Schwind)

Now it's time to agree on terms, sign the contract and move ahead. (Forbes)

Both companies however, confirmed the deal was off after they were unable to agree on terms. (BBC News)

Once you agree on a price, make sure to split the payments in such a way that the final payment (a substantial portion of the total amount) will be made only when the work has been fully completed and you have signed off on it. (Forbes)