As one of its daily deals, Kmart offers the DieHard Portable Power 750 Jumpstarter with 12-volt Outlet and Light, model no. 71486, for $39.99. Plus, Shop Your Way Max members bag free shipping. (Not a member? It's free to sign up for a 90-day trial; otherwise, shipping adds $16.16. In-store pickup is also available.) That's $5 below our mention from two weeks ago and tied as the lowest total price we've seen. (It's a current low by $22.) It features 750 peak amps, jumper cables, and a built-in charger. Deal ends today.