I remember going to Radio Shack and buying crystals for my scanner !
Our area moved up to the 800 Mhg range many years ago and made all of those scanners useless.
I had a 800 programmable scanner that worked until they started moving the frequencies to different areas to keep us from listening to them. I had a buddy in the Fire Department that used to program my scanner for me, as it was very complicated, and after they started moving the freq's, if you did not know where to program it to, it was useless.
I have a few buddies that are in LE and even they say it is a pain in the butt when they have to take their radios in to be reprogrammed so often.