Amazon has the Blink XT2 Outdoor/Indoor Smart Security Camera for $74.99 (regularly $99.99), 2 Blink Camera Kit for $134.99 (regularly $179.99), 3 Blink Camera Kit for $189.99 (regularly $249.98), 5 Blink Camera Kit for $284.99 (regularly $379.99), and an Add-On Blink Camera for $64.99 (regularly $89.99) for a limited time.
The Blink XT2 is my Security Camera of choice. They are packed with features, affordable, and extremely easy to setup. They can be used indoor or outdoor and have estimated 2-year battery life. It runs over your wireless connection and features 1080P resolution with a 110-degree field of view, motion-activated instant-on recording, customizable motion detection, 2-way audio, live-view recording, and integration of Amazon Alexa.