Hope not already posted - checked and didn't see any. Not sure on size but seems in line with others as 15" dia.
Next cheapest is Amazon @£11.04 (at the moment)
This Pizza Stone and Cutter will give you an authentic Italian pizza experience at home
The quartz and clay based stone helps distribute the heat evenly across the base of the pizza, absorbing any moisture to help maintain the freshly baked texture and taste
Supplied with a 10cm stainless steel pizza cutter