Stanley Fatmax 140W Power Inverter | $12 | Amazon
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I’m not saying you’re going to need a power inverter in your car all the time, but it’s never a bad idea to have the option handy for plugging in a laptop, a light, or anything else that can’t run off of USB or DC power. This 140W model from Stanley includes a couple of USB ports in addition to a power outlet, and you can stash it in your glove box for just $12 today.