Doc,
This is the page for your county:
Greene County, Missouri (MO) Scanner Frequencies and Radio Frequency Reference
This is the TRS (Trunking System) that most of your county is on:
Springfield / Greene County Public Safety/Services Trunking System, Springfield, Missouri - Scanner Frequencies
This is the statewide TRS that you SHP is on:
http://www.radioreference.com/apps/db/?sid=6847
You HAVE to have P25 capability to monitor your area!
The following
Pre-Programmed scanners will work (They are programmed with literally all the RR database, and you can AUTOMATICALLY update them):
GRE PSR-800 (I would recommend this one, as it does some advanced stuff)
Uniden Home-patrol HP-1 or HP-2 (This scanner has a touch screen)
Those scanners allow you to simply enter you ZIP, and it AUTOMATICALLY pulls up the info for your county and allows you to scan.
Non-Preprogrammed scanners which will work (these scanners have some Pre-programmed stuff, but there's no way to automatically update it, so it will quickly become obsolete, and they might not have your area):
RadioShack Pro-106 (Handheld)
RadioShack Pro-197 (Desktop)
GRE PSR-500 (Handheld)
GRE PSR-600 (Desktop)
Uniden BCD396XT (Handheld)
Uniden BCD996XT (Desktop)
Hope this helps you!