B&H Photo Video has the Lorex 4-Megapixel Outdoor WiFi Bullet Camera (FXC13V) for $60 with free shipping. Features 2680x1440 resolution, 155° diagonal field of view, night vision up to 60-feet, built-in speaker and microphone, 16GB microSD card.
eBay has the Remo+ DoorCam WiFi Smart Over-the-Door Camera, (DCMU-1706) for $99 with free shipping. List price: $199. It fits over your door and features a 160° field of vision.
Amazon has the Rraycom 4-Camera 720P Wireless Security Camera System for $160 - $64 off with coupon 4S9CQ9G9 = $96 with free shipping. Features 8-channel monitoring, motion detection, IR day and night viewing, IP66 waterproof rating, Android and iOS compatible.