With Americans spending a reported $5 billion on Black Friday alone this holiday season, a lot of packages are being shipped and delivered, one way or another. PC Mike Wendland brings you three great apps to help manage all those purchases and deliveries. The Slice app sends you updates at every stage of the shipping process, like when a package is out for delivery and when it lands at its final destination. Not only that, but Slice will also give you a head’s up if a price drops right after you bought it. It works with Apple Watch, too. Slice is free for iOS and Android. ParcelTrack integrates shipments from…