Right now at Woot, take your pick of select automobile power essentials starting at just $21.99.
For example, check out this Amazon Basics 8 amp battery charger for 6v and 12v batteries with auto start and reverse protection for $32.99. Compare that to $46.74 direct from Amazon for a savings of $24.75.
Among the other choices available today is this SL1648 rugged lithium by Schumacher portable power pack and 1250A jump starter for $117.99. Compare that to $130.31 at Amazon.
See the full list of everything for sale here.
Shipping at Woot is free within the contiguous 48 states for Amazon Prime members, or $6 without membership. These deals will only last through October 13 and can change or sell out at any time.