20 Security Products under $25

Most intruders know to attack a door at the lock—but what if your door had an extra lock in an unexpected place? The Defender Security Lock can easily be installed nearly anywhere on the inside edge of your door. It's easy to lock and unlock from the inside, but it's impossible to tamper with from the outside. Plus, you can place it high on the door so small kids can’t escape when it’s secured.

But it’s not a perfect fit for every door. You may need to get handy with a chisel to fit it on some doorways. You may also need to replace it after a few years of wear and tear. It’s a good idea to look for these on sale and buy a couple at a time so you can replace one as soon as it shows deterioration.

If you're worried that your locks aren't secure enough, a door jammer security device like the SABRE Security Bar is a good option. It fits under your door handle and adjusts to the length you need. A rubber foot prevents the bar from sliding on your floor.

Standard window locks work well for keeping windows shut, but if you want to be able to keep your window partially open for ventilation, Defender’s Sliding Window Locks offer both protection and airflow. No screws required, just clamp it on to the window track at the desired location.

Gripping pads on Lion Locks door and window locks keep them secure on any sliding door or window track. Double thumbscrews make installation easy and snug. Choosing the lock placement along the track lets you control how far your door or window opens.

Compare the competition on our best sliding door locks review page.

The Addalock does just what the name suggests: It adds a second lock to your doorknob. You can use it on a front door or on interior doors to block anyone from getting in. It takes seconds to install, and it won't leave any holes or marks, so it's a great security device for renters.

The Defender Sliding Door Security Bar is just like your grandma's broomstick in the sliding door track, but with handy components like a hinge that makes it easy to lock and unlock without removing the entire thing and an adjustable telescoping length.

A whole-house alarm system with monitoring might not be in your budget, but there's no reason you can't still scare off intruders with a loud noise. A five-pack of push-button Taiker alarms is under $20, so you can stash one in every room of your house.

Even though the SABRE alarm is marketed for commercial doors, you can use it to secure any door in your home, including your garage or shed door. It's easy to arm and disarm with your own four-digit code, and you can choose between alarm and chime modes.

With three separate alarm components, the GE Personal Security Kit is a smart going-away present for any college student. It comes with a door/window sensor alarm, a keychain panic alarm, and a doorstop intrusion alarm. All are battery-operated and easy to arm and disarm.

Door and window sensors like these GE window/door alarms can work almost as well as a full security system without monitoring. Just mount the sensor and the magnet and then select between "Alarm," "Chime," and "Off." The sensors' shrieking, 120-dB alarms will surprise any would-be intruders.

Burglars are much less likely to snoop around a house that's well lit, and HMCity's motion sensor solar lights can ensure you always have the lights on. Motion detectors sense movement to trigger the lights, and these lights come with three different lighting settings.

Compare the competition on our review pages:

• Best Outdoor Security Lights
• Best Motion Detector Lights

You might not want to splurge on smart doorbells with cameras, but with the SadoTech Wireless Doorbell you'll always know if someone's at the door. Just mount the doorbell next to your front door and plug in the base unit where you’ll hear it best.

The TOGU peephole gives you a full 220-degree view of someone standing outside, and it comes in eight different finishes to match your door hardware. The included cover prevents anyone from peeking through the hole from the other side.

When we found these cheap security cameras, we knew they had to be on the list. But the ZOSI 1080p CCTV Camera doesn't come with the needed DVR or cables, and the monitoring app for smartphones and tablets is difficult to use. Still, the cameras work well for monitoring in all weather conditions and come with lifetime tech support.

Learn more in our ZOSI cameras review.

Smart home devices for under $20? It seems too good to be true, but the Frankever Mini Smart Plug Outlet gives you a lot of home automation device management for a low price. Using it with lighting lets you turn house lights on and off from anywhere with your smartphone or, if you have a home assistant, voice commands. IFTTT (If This, Then That) compatibility means it can also be used with other smart home security systems if you choose to add more home automation security devices later on.

This VIPERTEK isn't just a good deal—it's one of the best stun guns on the market and one of the best personal safety devices for everyday carry.

The VIPERTEK Stun Gun Flashlight delivers both a loud crackling noise and a nonlethal shock when it's activated, and it's rechargeable. Shine the bright light into the attacker's face to further disorient them. 

If you live on a ground floor apartment, you shouldn't have to keep the blinds closed and feel like you're living in a cave. Gila Window Films are tinted black to reduce passive solar heating while completely obscuring the view of any curious passersby.

Although more expensive, there's also window film that makes it tough for would-be intruders to break the glass. Check out our top window security film picks.

Just in "case" someone does get into your home, the steel-shelled Amazon Basics Security Case keeps jewelry and firearms under combination lock and key. The included security cable lets you secure the case to a heavy piece of furniture or household fixture.

Although most cost more than $25, check out our full lineup of the best home safes and best gun safes for more options.

Intruders may try to kick in your door, so don't make it easy. Simply installing a new strike plate like the Defender Security Combo with 3-inch screws can give your door the strength it needs to withstand a forced entry.

For a little more than $25, you can also pick up a door jammer for extra security. Ready to drop some serious dough on door security? Get a heavy solid wood door.

As the saying goes, "Fake it till you make it." When it comes to security, fake isn't actually a bad idea. A realistic decoy security camera like the EXCERCUS is an excellent crime deterrent. It has battery-operated LED lights to give the illusion of night vision, and you can get two for under $20.

For a little more money, you can get the real thing. Check out our top security cameras under $50.