The only CR123 cells I have consist of a 12 pack I bought for my Surefire lights. I honestly don't use the Surefire lights much because they are simply too bright. I stock up on AA and AAA because the bulk of my survival gear runs on them. In that stock I have both lithium and alkaline AA & AAA batteries. All my AA and AAA lights are regulated and can use either Alkaline or Lithium. One light loses its hazardous area cert when used with lithium batteries, but the light will actually run longer. I also have NiMH rechargables and a solar charging unit so keeping lights and radios running is not an issue. The fresh alkaline batteries in my 3-D mag-lite and Streamlight Tasklight will be all the D's I need short-term and since both are now LED, they run a long time.

In an emergency I might buy more batteries if they were available, but those would be for neighbors.