Jobs at small Tulsa companies nobody posts about - what worked for you?

A friend who works at a local manufacturer says there are openings not advertised online. This is my first time dealing with any of this. They prefer people who can start within a couple of weeks. Does anyone have similar leads?

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

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