I think a lot of law enforcement agencies are switching back to the 9mm from the 40 lately. I think they are starting to realize that a couple of good shots with a 9mm are just as effective as a couple of bad shots with the 40 and the 9mm is typically easier for most people to shoot comfortably and accurately. Not to mention the wear and tear on a service handgun tends to be less in 9 than 40.

I'm seeing lots of Glocks, M&Ps, and Sigs popping up cheap as law enforcement makes the switch to 9mm.