Amazon has the TaoTronics 4K Waterproof Sports Action Camera for $47 with free shipping. Features capture Life at 4K 30fps, Wi-Fi, and iOS/Android compatibility, built-in rechargeable battery, comes with a protective waterproof case, a helmet mount, a bike mount.
Amazon has the Reolink 1080p 4-Ch. Wireless Security System for $200 with free shipping. List price: $300. Features 1920x1080 video recording, 100-foot night vision, 1TB hard drive, automatically activate in low light conditions, smartphone compatibility.