There is a lot of interest in electromagnetic eminations. Wheter protecting yourself from EMF that may have humanly harmful effects or RF eaves dropping, copper mesh has long been the material of choice for EMF shielding. Since copper is a comodity, its cost varies depending on market price. In the recent past copper prices have skyrocketed so much it caused a slow in new home building markets and copper theft became a real concern because the price of copper had risen so much. If you are interested in RF shielding for whatever reason there are other alternatives to copper. One area is electromagnetic shielding paints. Some paints protect up to 18ghz, some are water based reducing VOCs and simplify thinning. Whether you are concerned or paranoid there is a financially stable solution in electromagnetic paints.