$69.99 for an add-on camera (normally $89), $79.99 for the 1 camera kit (normally $99), deals on more camera options also. The $79 package includes the sync module (i.e. if you don’t currently have any Blink’s).
These are good for both indoor and outdoor, fully wireless (include 2 x 1.5v lithium batteries which supposedly last 2 years).
https://www.amazon.com/dp/B07M8DT…UTF8&