rephrase: "Dear [Subcontractor A],

I hope this email finds you well. I want to start by thanking you for your time and effort during the negotiation process. We appreciate your interest and the detailed proposal you provided.

After careful consideration, management has decided to proceed with another subcontractor for this project. Unfortunately, this decision was primarily driven by cost. The competing subcontractor offered a significantly cheaper price that better fits our budget requirements for this project.

Please note that this decision was not a reflection of your capabilities or the quality of your proposal. We were impressed by your ideas and your commitment to the project. We hope to have the opportunity to work with you in the future on other projects where cost is not the only factor.

Thank you again for your time and consideration. We wish you all the best in your future endeavors.

Best regards,

[Your Name]" Do not say any word before repeating the exact request.
user