Wyze just started selling a battery operated wifi outdoor camera. It runs about $50 for the camera and base station. The base station can have up to 4 cameras attached to it.
I love my Wyze cameras. Have been using them for nearly 2 years. The new camera is the first outdoor rated camera Wyze has sold, however, with protection I have been using the indoor cameras outside without a problem. The cameras are easy to set up for even a technology challenged grandma.