Professional cover letter needed

Hello, I'm a writer myself and can quickly turn around copy for clients but seem to be struggling working on my covering letter, which I need today. I need someone who can write an expertly written covering letter, matching my skills and experience to an employer's / recruiter's requirements. Basically, something that will tell them why they should interview me, rather than all the other applicants. Please bid only if you can turn around sparkling and engaging copy quite quickly and have significant experience writing professional resumes and covering letters.