Amazon currently has the Belkin NetCam HD+ Smart Security Camera available for just $49.99. This is a great price for this camera, since it is usually priced around $129.99, and also makes this one of the cheapest security cameras out there right now.
This camera is made by Belkin, so there's no surprise that it works with its Wemo smart home platform. That means that it will work with its other products like the Wemo smart plugs, crock pots, light bulbs and more. Unfortunately, it doesn't really work with Google Assistant or Amazon Alexa, though it can technically do it. This is a pretty small camera, and is easy to hide in your home, and it does stream in HD quality. So you're looking at 720p resolution on this camera from Belkin. Obviously that isn't the best resolution, especially when there are some cameras out there now with 4K quality, but it will still get the job done, and that is definitely what matters right now. This camera does need to be plugged in at all times, since there is no battery inside to keep it running without power. It's also not weatherproof or waterproof, which means that it can't be used outside to keep an eye on your front door, or even your yard.
This item is also eligible for Amazon Prime's free shipping. Which includes free two-day shipping, and pretty cheap (usually $3.99) next-day shipping if you need it extra fast. If you are not an Amazon Prime member yet, you can sign up for a free trial of Amazon Prime. You'll get 30 days free (if you're a student, you get 6 months), and then it's $99/year (or $49/year for students). Prime members do get a whole lot more than just free shipping though, so be sure to check out the full benefits.