Small employers hiring around St. Louis - what worked for you?

Two small St. Louis employers told me they are hiring but have not posted yet. I worked as a call-centre agent before this. They like a brief email with a résumé. Does anyone have similar leads?

Small employers often hire on recommendation. Ask neighbours, former co-workers and your library.

A short email with two sentences about what you can do and your résumé attached worked for me. I followed up after a week.