Alternator and Central locking system controller

[The Balakrishnans]

My 1990 200 (TQ) wagon needs a new alternator.  I see that Blau has them for sale (Bosch) for about $ 175.  I have never bought anything from Blau.  IS it a good price, and is V\Blau reliable in your experience ?

The central locking system has also gone completely dead.  I was told by my mechanic that the control unit located under the rear seat needs tro be replaced -- $ 400.  Boy.. these cars are expensive to maintain !!  Can anyone guide me on where I might be able to get this part at a lower cost ?

I appreciate the help. 
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