$0.01
Energizer Watch/Electronic Batteries, 3 Volts, 2032, 2 batteries (Lithium Button Cell)
$1.99
Energizer 377-376 1.5v #377/376 Watch/Calculator Battery (5 Pack)
$4.28
Duracell D389/390PK09 Silver Oxide Electronic Watch Battery, 389/390 Size, 1.55V, 70 mAh Capacity (Case of 6)
$8.45
Duracell D303/357PK08 Silver Oxide Electronic Watch Battery, 303/357 Size, 1.55V, 165 mAh Capacity (Case of 6)