McDonald's recently started selling "Collector's Meals," also known as adult Happy Meals. These meals come with collectible drinking cups themed around nostalgic McDonald's promotions and characters. The cups have become very popular collectibles, and resellers have listed sets and individual cups on sites like eBay and Mercari for prices up to $125  within a week of the launch. The cups available reference past McDonald's promotions and characters like Hello Kitty, Beanie Babies, Shrek, Jurassic Park, and Minions. McDonald's is only offering the cups free with a Collector's Meal purchase in restaurants for a limited time.