Most visitors online was 1660 , on 12 Dec 2020
HiChris: places like CVS & Walgreens should also sell plain batteries if I'm not mistaken. Look for the packages that don't say "alkaline." Since we can't buy mercury batteries any more, and they sure don't make AAA, AA, C & D in the composition of the small button batteries, if its not rechargable, or alkaline it has to be carbon-zinc.
so what's about my suggestion to use "C-sized Adapter Shells for AA Battery" (this is a product name at amazon.com)? You can add some metal parts until the weight fits. AA cells are only about 1mm longer than C-Cells.