Amazon has discounted $50 Uber Gift Cards right now, taking $5 off of them (or about 10%). But that is when you use the promo code UBER at checkout. This is a great deal, since you're basically getting $5 free on this gift card.
If you're thinking of drinking a lot this New Years Eve to bring in the new year, then you'll want to pick up one of these gift cards and save yourself some cash on your ride home - of course it's never a good idea to drink and drive. Uber allows you to get a ride virtually anywhere. It's like having your own taxi, from your smartphone. It's also often times cheaper than a taxi, and you don't even need to worry about how you're going to pay, since it does it automatically through the app. This gift card, while being a gift card actually works more like a credit. So you put the gift card in your Uber account and then it is good until you use it up. And if you're going fairly short distances, this could last you for 3 or 4 rides, which is pretty good, to be honest.
This is a digital good (though it is not part of Amazon's Digital Day today), and there's no shipping here. Once you add it to your cart and purchase it, Amazon will email you the code to input into your Uber app - it will also give you instructions on how to claim it and everything.