Summer is prime travel time, and hotel owners know it—so they hike up rates in top vacation destinations. But who's staying in all the empty condos and apartments when their inhabitants go on vacation? It could be you, and you could save a bundle. Not only do vacation rentals let you save money by giving you more space than standard hotel rooms, they also typically offer full kitchens and a host of other desirable amenities. Plus, rentals are often less expensive than comparable hotel rooms—sometimes by hundreds of dollars. We've partnered with our friends at FlipKey to show you top-notch rental properties available in U.S. cities for less than the price of a hotel.