Meta-Materials are the assembling of many elements to form a new and extra-special new material. Their expense comes from the precise shape, size and orientation at the microscopic level which allows for the creation of properties that are unavailable when using conventional methods.
At present we are able to utilize this for invisibility cloaking, but there is so much more. Perhaps this will solve the radiation problem in space that threatens astronauts on their long journeys. As detailed, Meta-Materials are about the creation of new properties from old; This means that we are limited only by our own minds, and maybe physics.