It’s not always easy to travel on a budget, but you might be surprised by the existing travel discounts you didn’t even know you qualified for.For example, did you know that Sam’s Club members can get discounted travel?They’ve partnered with Expedia, which means you can go to the Sam’s Club Web site and find deals that aren’t offered anywhere else.And don’t forget to pull out your union card.The Union Plus Travel Club offers discounts for most AFL-CIO union members.That includes up to 25 percent off car rentals. And look into college alumni programs.My alma mater, the University of Wisconsin, recently had a trip to China that was $200 less than booking with the tour company directly.But do your homework first.For example just because a hotel advertises a 10 percent discount for senior citizens, that often means 10 percent off the regular rate, not the lowest available.So be smart about it. Call the hotel, ask for the lowest available rate, and then tell them to apply that discount.Get more advice in our Budget Travel section.Looking for more advice? Click here for more Daily Travel Tips.