You said best, then you said affordable.You get what you pay for.You can get a boxed system from Sams club that uses batteries that you have to replace and works off wifi.these are OK systems for around $300.00I have a Digital Watchdog Camera System that is hardwired and powered over Ethernet cable.

These are much more reliable and their are no batteries to have to deal with.I use Digital Watchdog cameras and software.if you want to view any camera remotely you'll need an internet connection.

.)$80,000-$200,000EA51Water Submeters$185.00EA52HVAC Units & Grills$3,450.00Unit(1000SF)53HVAC Ducts Replace$500.00Unit(1000SF)54Tub Refinish$500.00EA55Bath Faucet$60.00EA56Kitchen Faucet$115.00EA57Kitchen Sink$175.00EA58Fiberglass Tub Replace$950.00EA59Toilet Change$135.00EA60Outlets & Switches$750.00Unit(1000SF)61Ceiling Fixtures$75.00EA62Ceiling Fans$220.00EA63Panel Replacements$635.00EA64Additonal Wiring$250-$5,000EA65Smoke Detectors Battery$17.00EA66Smoke Dectors Wired$40.00EA

There are about a dozen modules or bonus material. 

A lot of investors seem to stick with that business module and that one only.

Ooh i just remembered Tom Henderson, who teaches partials, http://www.hpnotes.com/.Here is a course that's online for free by Troy Fullwood but it's fairly old but the main content is still relevant.https://mortgageinvestorpro.com/module-1/I'm a note buyer, feel free to send me a tape (list) of notes that you're selling or brokering. 

thanks.PD: they said the installation and the actual the sump pump costed 9k also has a back up battery.

I’ve heard about recent developments in the city, including Stelantes battery establishment, an Amazon warehouse, a new bridge, and the construction of a mega hospital.Considering the property’s condition, ongoing expenses, and potential development in the area, I’m contemplating whether to sell, especially since the property is not cash flowing and needs substantial renovations.

He has a current domestic violence case (felony domestic battery) that is pending, and it has been working its way through the court system since Nov 2021.   

Hopefully it just needs a battery like mine did!