Lego Tray 10 x 20 in Green Baseplate, Handmande, New 11.6 x 21.6 x 1.6 in | eBay
Amazon.com: Plastic Trays for Classroom, Office Organizing, Arts & Crafts - Letter & Papers Flat Storage Bins - Sensory Tray - Set of 4 Colors - Great for Lego, Sand, Crafts, Painting,