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The hit of the '70s houseparty is making a comeback. Blame it on chocolate fountains—the now-ubiquitous sign of a good time at weddings, proms and baby showers is inspiring people to crave chocolate-dipped treats at home, Griffith says. New and vintage sets are equally popular, though you can usually resell old avocado green, cinnamon red and harvest gold models for more, since they can double as retro display pieces. Basic fondue kits typically go for $10 to $30.