Amazon is currently selling a 3-pack of the Arlo Pro 2 security cameras - and the siren is included - for just $619. That is good for about $60 off of the regular price here, and considering the fact that these cameras go for around $229 each, this is a pretty good price for three of them.
The Arlo Pro 2 is the newest security camera from Arlo - formerly part of NETGEAR but now its own company. It's a wire-free security camera, so that you can use it both inside and outside for keeping an eye on your home. There are mounts included in the box, so you can mount it outside your home pretty easily, and see what's happening at night. And this is because there is nightvision included in the Arlo Pro 2. It is also capable of sending you notifications when it notices movement in the area. And because of this, it is not recording 24/7, instead it only records when it sees motion. This allows the battery to last longer (about six months or so). The Arlo Pro 2 does also work pretty well inside, so you can have it aimed at the front door or a window, to see when intruders are attempting to enter. It's a great camera to have, and be able to keep an eye on your home when you are not at home.
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 $119/year (or $59/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.