When I started on this journey I just wanted to control a few lights locally and with a remote.
That quickly blossomed into pretty much a full automation. No voice/alexa/echo/etc as I don't really believe in wiretaps in my house.
. But seriously. Call me crazy or conspiracy freak. I am not getting one.
With that being said. I can turn all lights off when I leave with one button on my keychain. The wife loves she can push a button and inside lights pop on ready for her to enter her home. I can arm a (fairly lame) security system, but it's loud enough the neighbors come check it out and call me. Set scenes when on vacation. Have the lights turn on at dusk and after we go to bed. Turn on in the morning and off at dawn. And the list keeps growing. Currently I am working on a door bell system and when that is working I will be able to send an email when someone pushes that button and I am on vacation. That with a camera will tell me to call my neighbor and ask him to pick up the amazon package.
As for cheap.....well that is the old triangle. Cheap/Fast/Quick. Pick two. And only two. You cannot have all three. When I started just controlling a few lights we were only talking about a couple hundred bucks. With my pro installation
maybe four hundred total for 5 or six lights. Now where I am at....yah.....pretty much about a grand. But the point is made. Home Automation with some sort of security that is under 1K. Pretty fair in my opinion.