For a limited time, this DieHard Automatic Battery Charger drops from $69.99 to $39.99 at Sears. That's the best price by $17 we could find for this well-reviewed device, which is suitable for charging all vehicles with 12 volt batteries, from cars to motorcycles to tractors. It features a 2 amp trickle, 10 amp fast charge, and 50 amp engine start and is housed in a rust-proof, shock-resistant casing. Shipping is free with in-store pickup or a 90-day free trial of Shop Your Way MAX; otherwise, it adds $12.38. Sales tax is charged in most states.