Amazon offers the Arlo by NETGEAR Security Camera - Add-on Wire-Free HD Camera [Base Station not included] | Indoor/Outdoor | Night Vision (VMC3030), Works with Alexa for $59.69 with free shipping.
Works with Alexa for voice control (Alexa device sold separately).
Add on Camera only - Base Station Required
Patented 100% Wire-Free design for easy placement anywhere
Night vision cameras work even in the dark
Motion activated cameras w/ email or Arlo app notifications- Records and alerts only when motion is detected with 7 days of free rolling cloud storage
Indoor/ outdoor Weather-resistant cameras. Operating temperature: 32° to 122° F (0° to 50° C)
Add on Cameras only – Base Station Required