If you're looking for more than 3 cameras, you're best off looking at a DVR system. This is comprised of 4 or more cameras hooked to a central recorder box containing a large hard drive.
Pros
- One point of internet connection
- One point of viewing and recording
- Only needs one storage device for all cameras
Cons
- DVR should be in accessible place which can make for complicated wiring
- No redundancy - If central box fails, all cameras go out
Good: $130, ZOSI 1080p 4cam/8ch
- 4 x 1080p / 2 megapixel cameras
- expandable to 8 cameras
- 1 terabyte drive installed
Better: $256, ANNKE 1080p 8cam/8ch
- 8 x 1080p / 2 megapixel cameras
- 8 channel DVR (no expansion)
- 1 terrabyte drive installed
Best: $409, SMONET 5MP 8cam/16ch
- 8 x 1920p / 5 megapixel cameras
- expandable to 16 cameras
- 2 terrabyte drive installed
Wallet Killer: $750, Swann 5MP 8cam/8ch
- 8 x 1920p / 5 megapixel cameras
- 8 channel DVR (no expansion)
- 2 terrabyte drive installed
- advanced heat and motion detection
- 130' night vision
- quick find motion playback system
- compatible with Alexa screen devices