Having packages left on your front stoop is always a dicey proposition, but is Amazon's new plan to allow delivery people to unlock your front door so they can drop off packages inside your house the answer? On Wednesday, the e-commerce giant unveiled a new service called Amazon Key that allows couriers to open your door with a simple swipe on their smartphone after scanning a barcode. Their moment of entry is videotaped via Amazon's new Cloud Cam, which is part of a $249.99 bundle that includes a smart lock and free installation. Amazon Key can also be used to let housecleaners or friends and family into your home as well. Prime customers can preorder the bundle now, with the Key app and delivery service launching on November 8 in 37 U.S. cities.