You mean they didn't stock it?
I had a good laugh the other day when I went in to find a standard PC
CMOS battery (the little blocks used in practically every PC thru
486's)... and it was a special order part... but two out of the 3 Mac
Odd, but no Radio Shack doesn't even list them in the catalog.
OTOH I still have several cases of new old stock I am selling off. So if
you need an 840 or 844b 4.5v alkaline cmos battery, email me while I still
have them. 1/$5, 3/$10, 10/$20, and case of 60 for $50, all plus shipping.