Walmart is selling a Skil PWRCore 12 Brushless 12-Volt Cordless Drill and Impact Driver Kit for only $68. The list price of the kit is $150, so buyers are saving a whopping 55%.

This LED kit from Nilight is a basic—but perfectly functional—product. The 12-volt plug makes installation a breeze, and the back of each strip is equipped with sticky 3M tape.

Your electric car or plug-in hybrid is propelled by a sophisticated lithium-ion battery, but you'll probably also find a lead-acid 12-volt battery in there somewhere. Don't throw away your jumper ...