My first annual was $14850.00 by a shop that did the prebuy. The price went
from 10K at 5 pm to 14850.00 by 7 PM. When I ask "why" they said we found
some
things. They did not even work after 5.
Most of the $$$ was for labor. Like 55 hours of inspection, after the prebuy.

Sounds like you bought a neglected twin or a really neglected complex single.
There are pre buys and there are pre buys. My company is owned by a large
corporation and they don't even want us to call it a pre buy or pre purchase
inspection. If the customer wants to call it that then I have to do a complete
annual inspection. I can do an aircraft evaluation but I can't call it a pre
buy inspection. Seems they got sued for just the sort of situation you are
describing.

As for the price jumping nearly $5,000 it is not unheard of but it is
inexcusable that they could not tell you sooner or explain it more fully.

John Dupre'