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Do you mean like this:
Thank you for your letter dated 10 May, providing a quotation of [xxxx] for printing the journal.
This figure is within our budget and we would like to accept your quotation. We will be providing the material within the next month, and will contact you with it as soon as we have completed our preparation. Please let us know your proposed schedule for proofing.
Please note that we expect completion by 25 June in order to ensure publication on 31 June.