NEED HELP !

My 2002 X5 (E53) need a new Air condition Control Unit (complete set).
It is totally kaputt !

The part number is 64 11 6 927 898.

Where can I get that part fast and . . . cheap of course? New or Used.
Or can someone offer me?

My local dealer said it will take 3 weeks and what a price!!!

Please help my X5 to up and running again very soon.

MANY THANKS !