Need gold coating on glass

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I neeed to find a company that can coat glass with a thin layer of gold. My search so far tells me that this is done by sputtering. I would like to find a shop in the Boston, MA. area. At present I have two glass pieces that are 7.5" diameter and one piece that is approximatly 20" long X 9" wide. The glass has a rippled surface that must be coated with gold that is thin enough for light to pass through. These pieces are being done in anticipation of a larger contract that will call for about 40 more pieces.

David Hochstrasser
Clock restoration - Hanover, Massachusetts