Whatever you get, make sure that the radio will comply with the new narrowbanding requirements that will take effect after the first of the year. All radio classes are being required to go through this mandated update. I just found one website that has been helpful. He's in California, so his prices may be a bit high. Check out:
Surplus Two Way Radios. And remember, even with the narrowbanding requirements, you need to find out if you're system is operating with a repeater or not. If so, you'll need to know (a) Transmit freq., ( B) Receive freq., and © the sub-audible tone that keys the repeater.
If you can make contact with board member Jordan Phillips, he works at a radio shop and would be more help with specifics than I can.