Thumb Score: +18

Amazon [amazon.com] has Craftsman V20 4.0-Ah Lithium-Ion Battery for $35.10.
Shipping is free.

Price
$83.90 lower (71% savings) than the list price of $119
$3.90 lower (10% savings) than the previous price of $39

Cashback
10% back with Prime Card Bonus [amazon.com] (click to check)