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From professionally installed systems such as ADT and Brinks Home Security to DIY solutions such as Simplisafe, security systems like can cost an arm and a leg. But if you know just where to look, you can find affordable deals on security devices including detectors, doorbell camera options, lights and other smart security systems that don't require professional installation. So how do you avoid hurting your pocketbook while trying to keep your home or apartment secure? 

Check out these cheap home security devices, including door sensors and window sensors, security cameras and motion detectors -- many often on sale for under $20. These cheap home security options and smart home devices can help secure your house and bring you peace of mind when you're away from home.

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One of the most obvious deterrents to would-be intruders is an occupied house. Throw some smart lights into your kitchen, living room or front porch fixtures, schedule them to flip on at certain times during the night, and you instantly make your house much less appealing to the more-skittish thief.

One of the most wallet-friendly options: The Wyze bulb. You can get one for $8 or four for $30 -- not too much more than a regular LED bulb. These cheap home security gadgets connect directly to your Wi-Fi network and can be controlled with the Wyze mobile app through your mobile device. These lights are perfect to schedule through your app and forget about.

Screenshot by David Priest/CNET

While we're talking deterrence, it might be worth considering dummy cameras as part of your security kit. Especially for larger properties, where you want to cover a lot of ground without breaking the bank, fake security cameras can make your house look like a locked-down compound at an affordable price. You can order a four-pack of dummy cameras for under $20 here.

Of course, deterrence will only get you so far with fake cameras. If a burglar breaks into your house, you'll still want alarm systems -- either some sort of alarm monitoring device or motion detectors -- to alert you to the breach. Read our top home security cameras list including Arlo Pro and more.

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As CNET's Megan Wollerton has pointed out, "The era of the $200 security camera is over." Today, you can find cheap security cameras for less than $30 -- yes, that cheap -- that actually offer most of the smarts and wireless security features of the higher-end models including night vision and a motion sensor with AI person detection. Wyze Cam is the wallet-friendliest smart Wi-Fi camera, and it offers free person-alerts to your Wyze app, 14 days of cloud storage and an SD card slot if you want continuous recording. This Wi-Fi security camera is pretty incredible for its affordable price. Read our Wyze Cam review.

Wyze Labs

If you're less concerned about recording specific rooms, and more interested in monitoring entryways to your house, the security sensor kit could be a better fit for you. Wyze is the security company that takes the cake again here, with a $20 security kit that includes a bridge (which connects to the Wyze WiFi camera and helps the devices communicate), two-door/window sensors and one motion sensor.

Again, for the price, this is a solid deal. For a small apartment, or if you're just monitoring your front and back doors, these smart home devices could keep you solidly covered with motion detection for super cheap -- eliminating the need for professional monitoring with shoddy customer service or false alarms. Read more about Wyze Sense.

Tyler Lizenby/CNET

As a relatively recent addition to the Echo's feature set, Alexa Guard can help keep an ear (or some far-field microphones) on your house when you're away. An Echo Dot, which you can find on sale for $25 fairly often, is the cheapest way to get Alexa Guard in your house. But if you already have an Echo, this monitoring service is totally free and can be set up through the Alexa mobile app.

Just say, "Alexa, I'm leaving" to switch on the feature. Then your Echo will listen for glass breaking, alarms or the sound of humans moving around your house (it can distinguish between pets and people) -- and you'll receive a mobile alert if it hears anything. Read our Echo Dot with Clock review.

Screenshot by David Priest/CNET

It can be tough for renters to boost their home security in part because installation can be pretty involved -- especially when you're talking smart deadbolts. So if you want to add a little security to your door locks without much hassle or cash down, consider a retrofit lock like this one.

Devices like these, while not Wi-Fi connected still offer clever ways to add one more barrier for burglars to bypass, which equals a little peace of mind for the anxious homeowner. And even though it lacks any of the bells and whistles of a smart lock (like a control panel or alarm), it's portable so you can bring it with you when you're staying at a hotel or an Airbnb. Read more about smart locks.

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