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?
$4.81 / 8 batteries = $0.60/battery
Brand: ACDelco Size: AAAA
$6.71 / 10 batteries = $0.67/battery
Brand: Duracell Size: AAAA
$6.99 / 2 batteries = $3.50/battery