D-link makes reasonable wifi cameras that can be used for home security and they double as baby monitors. You can buy 5-7 of them for the price of a single Nest

D-link makes reasonable wifi cameras that can be used for home security and they double as baby monitors. You can buy 5-7 of them for the price of a single Nest camera. They have motion/sound detection (lot can be improved though). Mobile app is slow but works ok. E-mail alerts with stills/videos are useful when you are away from home.