Carrara Bianco 1″ Hexagon Honed Marble Mosaic Tile available from The Builder Depot for $11.75 a sheet.
"I was terrified to order marble tile through the internet, but it was the BEST experience. The sample was great, ordered 130 square feet, which arrived fast & in perfect condition. The price was 20% of local stores, and Builders Depot were the best people to work with - fast, helpful, kind... you name it. AWESOME internet experience. Cannot recommend highly enough!"