NewAge Products Slate Gray 27.6-mil x 12-in W x 24-in L Waterproof Interlocking Luxury Vinyl Tile Flooring (13.44-sq ft/ Pallet) in the Vinyl Tile department at Lowes.com
MSI Peacock 12 in. x 12 in. Gauged Slate Floor and Wall Tile (10 sq. ft. / case) SPCK1212 - The Home Depot
Brazilian Slate Elephant Grey Rectified Matte 12x24 - Tiles Direct Store