Amazon has the ANNKE 720P WiFi IP Camera for $50 - $15 off with coupon M2AJFJZV at checkout = $35 with free shipping. Features record up to 720p HD resolution and has built-in WiFi so that you can view it remotely, it also has 32ft night vision, pan and tilt, and two-way audio.
Has good Amazon Reviews.
Amazon has the Eken 4K H9R Action Camera Kit (Black or Silver) for $70 - $20 off with coupon 4PHW38W5 (Ends 11/23) = $50 with free shipping. Features a 2" 1080p LCD, 4K video shooting, 12-megapixel photo shooting, wireless 802.11n, HDMI port, and waterproof casing to 100 feet.
Has excellent Amazon Reviews.
eBay has the Funlux 4-Ch 1TB NVR 4-Camera 720p Surveillance System (FS-1004-1TB) for $130 with free shipping. Features night vision clearly up to 65ft in the dark, weatherproof design, receive mobile notification when camera detects any movement, HDMI output.