Walmart offers the LEGO Classic Baseplate in Green for $5.68. (Amazon charges the same with orders of $25 or more, and Target charges the same via in-store pickup.) Opt for in-store pickup to avoid a $5.99 shipping fee. That's a slight drop from our January mention and the lowest price we could find now by $2. It measures 32x32 studs or 10" x 10".