When we bought our house three years ago (manufactured), one of the options we went for was ceiling fan wiring - it was something like $50/room to have them wired for ceiling fans in addition to lights. That included the extra switches and a junction box that was rated for fan weight and more or less "ready to add fans." Just, no fans came with the house.
We bought two when doing the "New home shopping run to Lowes" - one for the master bedroom, one (rather large - 70") one for the living room (since it's a large room).
... and then I kinda sorta let them sit in boxes for the next 3 years. They were out of the way, the place wasn't running too hot (we have vent fans in the window at night that suck cold air through, so it's quite comfortable without using much AC for large parts of the year), and... (insert excuses here).
Anyway, they're both finally installed. After three years. Out of warranty before even opening the box. :/ On the plus side, the living room fan looks quite nice in the living room!