I got them from TH Motorsports in Illinois. I paid $2600 for the pair (I was given a $50 discount for having to wait for one of the seats) and shipping was free to my Uncle's house in Phoenix.
European Spec. cars now have a Passenger Seat Sensor for the Airbag System but simply installing a 27 Ohm resistor* in place of the Sensor kept the system functioning. The Passenger Airbag will now deploy if the seat is empty but that doesn't bother me - if I want to make the effort, I can open the glovebox and turn-off the Airbag with the Car Key.
US cars have a different Sensor but an authorised Recaro installation shop should know how to circumvent this.
* I chose 27 Ohms because this resistance represents 50Kg - the weight of my Wife.