As a kid, I spent a lot of time with the JC Penney's Wish book. It was a big catalog that came in the mail around the holidays. It was thin pages, but printed in glossy color, and full of all the latest and greatest toys. Well, it had all kinds of things, but kids care not for clothes and bedding.
Catalog culture used to be a large part of the U.S. economy. To imagine how large, think about how much stuff we order online. Well, that's the catalog culture that used to be. You could get anything in the mail. Basically, you can still get anything in the mail, but you pick it out of shiny pixels rather than inky pages. One of the things that used to be common to order was houses. Yup, houses.
OK, so they wouldn't just drop a house on your doorstep. What you got was a really, really big LEGO set, or you can think of it like IKEA furniture taken to the extreme. Everything came pre-cut and labeled, all you had to do was put it together. There are thousands of the kit houses still around. The blog McMansion Hell has an exhaustive and fascinating article on how to recognize which homes were once pieces sent through the mail. I thought it was neat.