Product review (5 stars): They don't want you to think buying the filter via the Internet is a better deal. The bill is padded with their labor ...
Sub-zero doesn't sell the filter directly, they sell through distributors and service organizations.  If a service organization tells you they are selling the filter for $75, there is a reason.  They don't want you to think buying the filter via the Internet is a better deal.  The bill is padded with their labor and service time.  Try to buy a filter from a refrigeration appliance company directly, they aren't $75, if you don't have them install it.  Filters are easy to install, you just follow the way the previous one was installed.  You save the labor and or service call.  I found installing my own sub-zero filter quite simple and I'm not a handyman.