Here's some math on batteries. Because it's 2020, and who would have thought that we'd still be buying these all the time?
Brand: Maxell Size: AAA
$9.99 / 36 batteries = $0.28/battery
Brand: Maxell Size: AA
$9.99 / 20 batteries = $0.50/battery
$3.99 / 1 batteries = $3.99/battery