Cost of replacing intermittent wipers combo switch on 2008 Subaru Impreza

I have 2008 Subaru Impreza and my intermittent wipers are not working. The wipers also do not return all the way down when turned off but stay in the middle of the windshield. The Hi and Lo speeds are working fine.
I had a problem with the nut for the driver side wiper arm being loose.
I tightened the nut and the wiper works. After I fixed the loose nut problem I started having problems with intermittent mode. Since we are having lots of snow having wipers work would be very nice. Your advice greatly appreciated

Asked by for the 2008 Subaru Impreza
Is it a sedan or wagon? Parts and labor should be around $150.00 to $180.00 for the wiper switch asm.
Thank you for the reply. It's a wagon. Subaru in Boulder charges $271.