There are 2 manufacturers of consumer scanners that pick up digital communications, GRE and Uniden. Radio Shack sells rebranded versions of GRE scanners.
Both make handheld and desktop/mobile versions and they each have a wide variety of feature sets.
Check the RR Wiki and GRE/Radio Shack and Uniden forums for pluses and minus for each and then decide on a radio. There are way too many variables to consider to be addressed here.
Be advised that digital scanners run from $450 to $550 new so save your pennies (and nickels...)