Okay, so it’s relying on Wikipedia, but apparently Kinder Eggs are illegal in the States:
Kinder Eggs containing toys are not suitable for children under the age of three due to the small parts which may be ingested or inhaled. They are sold all over the world excluding the United States, where the 1938 Federal Food, Drug and Cosmetic Act, prohibits embedding “non-nutritive items” in confections. Additionally, the Consumer Product Safety Commission issued a recall on the eggs in 1997. Kinder Egg-like confections are available, but only in a form filled with small candies and/or stickers. There are some stores in the United States that sell genuine Kinder Eggs, often in conjunction with other imported British or other European sweets, although their importation is technically illegal due to the 1938 law and 1997 recall.
Personally I’d just ban them on the grounds they’re fucking shit.
(Tip o’ the titfer: Jeff Caylor’s Twitter)