Amazon has 4-Pc LEGO Education Large Building Plate Set on sale for $28.68. Shipping is free with Prime, or on orders of $35 or more.
2x 9.84″ square green plates
1x 14.96″ square gray plate
1x 9.84″ square blue plate
- Large building plates set provides building foundation for LEGO bricks (sold separately)
- Two 9.84″ square green plates for creating various earth landscapes including grass and forest scenes
- One 14.96″ square gray plate for building urban environments such as streetscapes and roofing