Amazon has the Blink Mini 1080p Indoor Plug-In Smart Security Camera 3-Pack for $50 with free shipping. Features motion detection, 2-way audio, cloud storage w/ Blink Subscription Plan (free 30-day trial included) or local storage on Sync Module 2 and a USB flash drive.
Woot! has the Advanced Technology 700TVL Video Tower Cam (CT736PB) for $34 with free shipping with Prime. List price: $267. Features day/night vision, 3.6mm lens, 2D-noise reduction, adjustable camera height.
Amazon has the Blink 3-Camera Outdoor Security Camera System for $140 with free shipping. List price: $250. Blink Outdoor is a wireless battery-powered HD security camera that helps you monitor your home day or night with infrared night vision. See, hear, and speak to visitors with live view in real time and two-way audio features on your Blink app.
Has good Amazon Reviews.