Wow! $55 to receive a stripped lower and run in through the books? That seems like a bit of rape there to me. The most EXPENSIVE shop around here that I have heard of charges $45, and they are a small store front that doesn't move many pieces.
We charge $35, as it's just to do the paperwork and run it through the books and out the door. Most shops are $35-$40.
Sorry Brother - You can pay for the whole build, and get what the kit includes, or you can take in the shorts and get input on each and every piece. That does suck though....