Nanny cams, like most other kinds of security cameras, can vary in cost. A nanny cam's price often raises with additional features, like 24/7 streaming, night vision, and lens quality. You can generally expect to pay $50 to $150 for a nanny cam, with some less expensive options having a more limited feature range. Our least expensive pick was the Yi Smart Home Camera at $25 and our most expensive was the Arlo Q at $199.