It would not be worth trying to get the equipment required to monitor CPS frequencies, they will be changing their system. (Sooner rather then later).
If you want to do some research regarding the CPS radio system and the equipment required for monitoring, check out
http://www.radioreference.com/
When I was in Red Deer I would listen to RCMP chatter, it was interesting. I have also listened to NY Port Authority/NYFD/NYPD and LAPD with interest as well.
Sometimes when there is a disaster they feature the radio traffic from that area, which can be interesting.