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
.) That's $5 under our August mention and the lowest total price we could find by $30. It features 750 peak amps, jumper cables, and a built-in charger.
Update: It's now available for in-store pickup only.