h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Shops that have sell Persian Rugs, which, like most rugs are usually rectangle, with funny patterns on them, but unlike most rugs, cost a visible percentage of the yearly income to purchase.
The shops themselves also have teleportational powers, which is why one minute you can pass a Persian Rug shop, and a matter of minutes later, when you finally decide that surely a little browse can do no harm and you head back to the shop, all you see is a totally empty building with lease me signs on them.