Game Shows

I don't understand how all of the game shows like The Price is Right and Who Wants to be a Millionaire? give away so much money and prizes. The audience members get in for free. I know that the show makes money by advertisers buying commercial time during their show. Other than that, where's their money come from? How can they give away cars, vacations, furniture, money, and more? There are so many shows like these that are able to give away such amazing prizes. It just doesn't make sense to me. I want to go on one of these shows and win the showcase! Although I don't get it, I'd love to win their prizes anyway.