Three places that offer free sample letters of interest, also commonly called cover letters, are the University of Georgia School of Law website, Tidy Form and Monster. Samples are available for those interested in both volunteer and professional positions as well as for students seeking jobs.
As of 2015, the University of Georgia School of Law website offers sample letters of interest for those seeking internships, wanting career advice or responding to a job posting, referral or unsolicited application. Although geared towards the legal field, the letters are helpful for understanding what kinds of information should be in the letter.
Tidy Form offers three interest letters for professionals, volunteers and students as of 2015, while Monster has specific samples geared toward job titles like marketing manager, administrative assistant, teacher and investment banker. Monster also has general sample letters.