Amazon offers Prime members the Pizzacraft Ceramic Baking Stone with Wire Frame, model no. PC0002, for $11.22 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $9.53.) That's the lowest total price we could find by $6. It measures 15" x 12".

Note, this has an estimated shipping date of one to two months.