Eco Pie Kraft and Black Paper Corrugated Pizza Box - Repurpose for Plates - 14 1/2" x 14 1/2" x 1 3/4" - 50 count box - Walmart.com
Choice 14" x 14" x 2" White Customizable Corrugated Plain Pizza Box - 50/Bundle | eBay
Amazon.com: 14" Premium White Corrugated Pizza Boxes Take Out Containers, DIY Decoration for Gift Box by SAI (10 Pack) (14" Length x 14" Width x 1.8" Depth) : Industrial & Scientific