Sears offers the DieHard 10/2/50 Automatic Battery Charger, model no. 71222, for $34.99. Plus, Shop Your Way Max members receive free shipping. (Not a member? It's free to sign up for a 90-day trial; otherwise, shipping adds $12.38. Free in-store pickup is also available.) That's tied with our February mention and the lowest total price we could find by $23. This device lets you charge your car battery from inside the vehicle and features 2 amp trickle, 10 amp fast charge, and 50 amp engine start. Deal ends April 26.