Factory prices for grey marble porcelain tile vary widely, from under $1 per square foot for bulk orders of basic tiles to $2-$10+ for higher-end, larger formats or specific designs, with common wholesale sources like Alibaba.com showing options from $0.48 to $12.80+ depending on finish (matte, polished, rustic), size (e.g., 60x60cm, 120x120cm), and order quantity. Expect prices like $2-$3/sq ft for large runs of rustic or basic matte, while polished, big-format, or premium-look tiles can be $4-$10+/sq ft, often with Minimum Order Quantities (MOQs) in the hundreds or thousands of square meters.