As one of its daily deals, Kmart offers the Plus Start Portable Power 500 Emergency Power / Jumpstarter, model no. 71489, for $34.99. Plus, Shop Your Way Max members bag free shipping. (Not a member? Click here to sign up for a free 90-day trial; otherwise, shipping adds $11.79. In-store pickup is also available.) That's $15 off and the lowest total price we could find, although we saw it for $5 less last month. It features a 500-amp peak, sparkproof jumper clips, and battery status gauge. It's designed for use in vehicles with 12-volt electrical systems. Deal ends today.