Haha. My brain went the same direction you did - After reading the post text, I thought OP might be looking to use the device as a standalone media player, not just client. I hadn’t noticed that OP specified “Client” in the title.

The article was referring to the cost to replace them, which would be both the equipent (camera, solar panel, pole, mounting hardware) and labor.

Edit: so yes, all told it appears to cost $3k to have a camera. But the camera piece alone would cost a lot less than that.