And to add some additional details, to monitor non-encrypted public safety agencies in the Columbia area, you need to look for a scanner that supports "APCO 25 Phase I Digital Trunked Radio Systems." APCO 25 is often abbreviated with "P25".
To make this more complicated, Palmetto 800 in the Columbia area uses "simulcast" sites tp provide coverage. Depending on your specific location, this can cause scanners that claim to support P25 Phase I systems to work quite poorly. Unfortunately, there are only 2 current consumer scanner models that specifically support Simulcast well, and that's the Uniden SDS100 and 200. There are other radio options that also support Simulcast, but they don't fall into the category of "traditional scanner" in the familiar sense.
Good luck with your search.