Here is the traditional Italian chocolate Easter egg. It is brightly-wrapped, hollow, with a gift inside (which may be a toy). The gift is a surprise, even to the purchaser. The egg can be industrial or artisanal, small or large (sometimes very large), milk or dark chocolate.
It isn't so easy to obtain in the US. Some are available through Amazon. Another possibility is to seek out any Italian foods specialty store in your area- it might be a good idea to inquire if they have them before you go. Or seek out specialized online vendors.