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27. Happy Meal Toys
McDonald's started selling its Happy Meals with toys in 1979, and if you had kids, you probably know firsthand how quickly those little plastic playthings could accumulate. Luckily, some of them might be worth money. If you have the full collection of Disney characters, you can rack up to $300 on eBay, and the mini robot sets from 1987 are selling for $140.