Here is another smoker detector shaped spy camera that lets you keep a close eye on your property. The Smoke Detector Fire Alarm Spy Camera has a 1080p camera inside. It is WiFi enabled and can be mounted on a ceiling or wall. It records video to a 16GB SD card.
The camera runs for 18 hours on a fully charged battery. You can get it for under $350 at this time.
[where to get it]