Walmart has the Defender 2K Wireless 4-Channel 1TB Security System w/ 4 Cameras (W2K1T4B4) for $270 with free shipping. List price: $580. Features remote viewing, 2K (4 Megapixel) resolution, IP67 weatherproof cameras, night vision.

Amazon has the Ricoh GR II 16.2MP Digital Camera w/ 3" LCD Display (Black) for $489 with free shipping. List price: $545. Equipped with Wi Fi functions for wireless connection with mobile devices such as smartphones and tablet computers. It is also compatible with NFC (Near Field Communication) functions for easy pairing with mobile devices. It features a large image sensor and GR Engine V, high-quality, high-resolution images, high-speed shooting operation.

Has good Amazon Reviews.

Amazon has the Arlo Pro Add-On Camera for $100 with free shipping. Features two-way audio, night vision, and 7 days' cloud recordings. Has good Amazon Reviews.