If you’ve been shopping for a do-it-yourself home security system, SimpliSafe’sMemorial Day salesmay have what you’re looking for. From now through May 31, SimpliSafe is offering 20% off its full line of security systems and components. In addition, SimpliSafe will throw in a free SimpliCam home security camera (usually $99) for free with all orders.Home security camera dealsare popular for smart homes and with DIY home security systems, and you won’t find a better deal than a free SimpliCam.

You can configure your security system by piecing together SimpliSafe components. It’s even smarter and a better bargain if you choose one of the company’s pre-configured systems. When you buy a pre-built system, you’ll have what you need when you’re ready to install it. You can save yourself the frustration that happens when you forget to buy or didn’t realize you needed a key component. Pre-configured systems also save money because manufacturers save when customers buy multiple components and can pass the savings on. We’ve listed SimpliSafe’s Memorial Day Sale pre-configured systems below in order of price. SimpliSafe configured each system for a specific type of application, but you can add other SimpliSafe components later if your needs change.

The Foundation— $183, was $229+ Free SimpliCam

The Foundation by SimpliSafe is the most basic configuration and is a good choice for a small apartment or if you want to start with a core system to build out later. The Foundation includes one base station with an internal siren, a wireless touch-to-wake keypad, an entry sensor for a door or window, and a motion sensor. Normally $229, The Foundation 20% off sale price is $195 plus it comes with a free SimpliCam.

The Essentials— $207, was $259+ Free SimpliCam

Choose SimpliSafe’s The Essentials configuration adds to more entry sensors to The Foundation, so you can protect three doors or windows. The Essential full component list includes one base station, one keypad, a motion sensor, and three entry sensors. Usually listing for $259, The Essentials is on sale through May 31 for $220 and also comes with a free SimpliCam.

The Hearth— $299, was $374+ Free SimpliCam

The Hearth pre-built home security system includes one base station, a keypad, three entry sensors, one motion sensor, a smoke detector, a 105-decibel siren, and a key fob. Adding the smoke detector, external extra-loud siren, and key fob for easy arming and disarming the system increases both home protection and user convenience. The Heart regular price is $374, but you’ll pay just $318 during the Memorial Day sale plus you’ll get the free SimpliCam.

The Knox— $359, was $449+ Free SimpliCam

With The Knox configuration you’ll have enough entry sensors for two doors and four windows plus two motion detectors to set at strategic locations. The Knox component list includes one base station, one keypad, six entry sensors, two motion sensors, a smoke detector, a 105-decibel siren, and one key fob. Typically $449, SimpliSafe reduced The Knox price to $382 and kicks in the SimpliCam home security camera for free.

The Haven— $391, was $489+ Free SimpliCam