Sears' catalog offered 447 models, selling over 70,000 houses between 1908 and 1940

"Sears Catalog Homes (sold as Sears Modern Homes) were ready-to-assemble houses sold through mail order by Sears Roebuck and Company, an American retailer. Over 70,000 of these were sold in North America between 1908 and 1940. Shipped via railroad boxcars, these kits included all the materials needed to build a house. Many were assembled by the new homeowner and friends, relatives, and neighbors, in a fashion similar to the traditional barn-raisings of farming families."

Image and text thanks to Wikipedia