What’s the heaviest thing you can buy from Amazon? The internet says it’s a 1,500-pound, 6-feet tall gun safe, but back when Sears was the go-to marketplace for everything mail-order, the American retail behemoth even sold houses. The buyer could choose from among hundreds of designs, pay in installments, and have the complete house shipped via railroad boxcars in separate piece of lumber, each numbered and carefully cut to fit its particular place in the house. All the buyer needed to do was find a local carpenter to do the assembling.