Power Shortage.

It seems I need to have some 9 volt batteries around.  I accidently drained the one in my guitar tuner, and when I starting pulling them out of my other guitar gear I found most of them were dead or dying.  I managed to find one that isn't dead, but now I need several replacements.  Most of them can be powered by AC power, but a few are battery only, and using batteries is sometimes just convenient.