I took a pic but realized it could be doxxy... at 2 supermarkets, I've noticed they installed this flatscreen above one of those waist-high freezers. They fill the freezer with products from one company, and the video plays an advert on loop. It's also really loud.
Capitalism truly breeds innovation.
I've seen them at a few Walmarts in the freezer section. Occasionally at registers.
Sometimes I've seen them above "fill a water jug" stations (but at least those require you to push a button to make them start playing).