I got mine from KDK, only $70 per piece.
It's different from the KDK that google installed (hers comes with remote control, mine doesn't).
Gotta check with your contractor / electrician tho, coz the minimum height clearance from ceiling to floor is 9ft.
Also, KDK is not HDB-approved. So its a risk .... (then again, some older resale flats have v high ceilings eg those in Tiong Bahru ... those definitely CAN install KDK).
I tink they're not HDB approved becoz the newer flats have lower ceilings, so by the time the fan is installed, it may pose as a danger (imagine streching your arms and touching the blades of the fan!).