Yi technology
https://www.yitechnology.com
They sell both outdoor and indoor wifi connected cameras at very reasonable prices. Camera resolution 1080p with motion capture, etc. Added benefit is that the cameras have a slot for a max 32G Micro SD card so you can self monitor. App is very user friendly - can easily review motion capture footage and download motion capture video to your phone. They have options for cloud storage, but I've found it to be very slow. I've built a system comprised of 4 outdoor cameras and one indoor camera which I enable when we leave on trips. Very satisfied with the purchase.
Nest is top quality for sure, but the cost of cloud storage adds up quickly.