Bass Egg Speaker is a serious effort to this concept work, and actually, it does is $99.95. It may be not according to your expectations, but it can create good sound at an average level. Loud volume on the right surfaces as other small speakers did.
Some speaker like this Bass Egg speaker put the vibration device in your hands. Let you turn everyday objects into a primary speaker. An undersized portable Speaker vibrates the mega surfaces and makes that vibration bounce back through an even larger box until it becomes much louder than it would be with its alone device.