One common buying mistake is comparing dummy CCTV cameras with working smart cameras as if they are the same product type. Working cameras such as the TP-Link Tapo C100, TP-Link Tapo C200, IMOU Bullet 3 3K, Eufy S210 Add-On Camera, Ring Video Doorbell Pro 2 and Ring Spotlight Cam Pro sit in a different part of the decision. They may record or connect to apps depending on the model, whereas a dummy camera is primarily a visible deterrent.
If your main aim is actual monitoring, compare Surveillance & Alarm Systems rather than dummy products. If your aim is a low-cost visual presence, stay focused on dummy cameras and signs so you do not overbuy features you will not use.
It can also be worth comparing adjacent Security products. Door Locks & Deadbolts, Padlocks, Lock Cylinders, Safes & Lockboxes, Fire Alarms and Gas Detectors solve different security and safety problems. A dummy camera may be useful, but it should not distract from the basics such as reliable locks and appropriate alarms.