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While summer is always the big travel season in the United States, Americans are changing the way they take vacations. For example, look at the new partnership between Groupon and Expedia. They're following the increasingly popular deal-of-the-day model and offering significant discounts on travel packages that can include airfare, hotels, activities, car rentals and more.

That's not the only way to get to your destination for less, though. Try using these 9 thrifty travel tips to save some money on your next vacation.

1. Discover Off-Peak Destinations
With nearly four-million square miles of land area, the U.S. is a big country. This means there are nearly unlimited places to travel. Destinations in California, like Los Angeles and San Francisco, are some of the most popular spots, but they're also the most expensive. If you think outside the box, you'll find some really cool locations to have a unique vacation without the crowds.

2. Shop at Auctions
Is your heart set on luxurious accommodations, but your bank account doesn't match up? The auctions at travel sites like LuxuryLink.com can help you find accommodations, spa credits, meal vouchers and free drinks for as much as 65 percent below the typical retail price. Auction king eBay also offers a variety of discount vacation packages in their travel section. Read more