How fun are these? Head over to Woot! and get the Melissa & Doug Deluxe Jumbo Cardboard Blocks, 24 Pieces for only $14.99 Shipped! The Melissa & Doug Deluxe Jumbo Cardboard Blocks set includes 24 blocks in 3 different sizes. It’s made from premium, extra-thick cardboard and holds up to 150 pounds. Let your kids use their imagination and have fun!