Do you not presently deal with a supplier that also carries alarm panels? For the cost difference, you might as well buy new. That way you will get all the manuals as well, user, installer, and programming sheets.
Most panels have a communicator built in but it is designed to go to a central station receiver. Some will also do numeric pager format. If you carry a pager or use a cell provider that offers paging format as part of their cell service it will work. I know Nextel does because I am on the Canadian version of them (Telus - Mike Network) and I have mine set up to do it this way. It will page a 4 digit identifier code (I use the last 4 digits of my home phone number) followed by a 2 digit status code (01, 02, etc for zone alarms, I use 9X and 5X for disarming [opening] & arming [closing] -think 9 to 5, and various other numbers for hydro out, low temp, high sump water, etc.)
The other option is to add a voice dialer to a panel. Not many manufacturers offer one, I know Paradox does (it works good). USP (United Security Products) has some real good ones that can be added to any system with a listen in feature;
https://www.unitedsecurity.com/autodialers.htm Careful if you do buy a used system. Make sure you have the installer code to get into it because if you don't, and the previous guy locked it, there is no way of getting into it (defaulting it).