My company's health insurance company spiffed everyone camera covers for their computers and phones. When we were in the office, I saw them everywhere, on both company-owned equipment, and on people's personal gear.

They had the health insurance company's logo on them, so when I saw one on a barista's laptop at the Starbucks down the street, I assume she got it from one of our employees and thought it was a good idea. Maybe people just don't know they're available, or cheap.