It is much more affordable to make your own porcelain tiles, as opposed to buying them. All of the materials for making tiles will average out to be less than $1 per square foot. \
Compare that to $2 to $30 per square foot when you purchase tiles, and you can see the price difference. \
However, it will take you extra time and labor in order to make the tiles. Depending on how highly you value your time, the savings of making your own porcelain tile may not equal out to being the more affordable option. \