Antje Danielson and Robin Chase founded Zipcar in 2000, patterning their brainchild after tried-and-true European car-sharing companies. Today, Zipcar’s fleet features more than 30 different makes and models, ranging from Mini Coopers and BMWs to Prius hybrids. A Zipcar promo code can unlock a discount membership, giving you access to thousands of these vehicles, day or night and all week long. All you have to do is reserve a nearby vehicle, pick it up, and, when done, drop it off at the same location.