Security cameras can get fairly expensive, and 'smart' cameras that connect to online services and mobile apps even more so. Arlo is Netgear's brand of smart security cameras, and right now you can get a bundle of four Arlo cameras and the base station for $350.
That may still seem expensive, even at $150 off the original asking price of $500. But the price-per-camera comes down to about $87.50, whereas a single camera kit (with the base station) normally costs $179.99. That's a pretty substantial value, if you're willing to spring for the larger bundle.
As you might imagine from us posting the deal here, you can monitor and control the cameras from the official Android application linked below. If you are interested, head on over to Amazon to buy it.