If you can do it yourself, it’s very cheap. With PoE cameras (power over Ethernet) you only need one cable that connects the camera to the recorder. With wireless cameras, you’ll still need to plug them in for power. If you have outlets outside in the right locations, then that’s fine. But if you plan to live where you are for a while, it’s highly worth taking a day to run some cables through the attic. It’s as simple as it sounds. Drill hole where you want the camera, fish the cable through, attach camera, etc. then run other end of cable into a closet or room with power; and plug into box.

Even if you fail and need a handyman to help you finish it, it shouldn’t cost very much. Rarely does it require opening walls or anything, if you have an attic.

Also a lot of systems will likely be cheaper on prime day.

If you can upgrade to the package with the turret cameras you’ll be even better off.

I’d recommend something like this system for your budget - includes all you need including 4 100 ft cables, 4 cameras, and a recorder.

https://www.amazon.com/Reolink-PoE-Security-Camera-System-4-Channel-Business-Recording/dp/B082R4Z4L4