Articles - Plastruct
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Plastruct produces a large quantity of plastic-based parts, sheet material, as well as strips. In general, take the "scale" that they mention with a grain of salt.

Spanish Tile (2 sheets; "HO-scale, 1:100") part # PS-122.
Red Brick (2 sheets; "HO-scale, 1:100") part # PS-97. Note that the material is closer to true red brick color; the camera over-exposed the image. Although the product is listed as "HO-scale" and "1:100", it is neither. When compared to prototype brick, it is a perfect fit for S-scale, 1:64.