If someone doesn't answer the price question, I will find out for you. (A lot of people have this done on the SP-01 model, and they may or may not see it here.)
I have never had a trigger job done on a CZ, because they all smoothed out around 1,000 - 2,000 rounds. Now that ammunition and reloading components are more expensive, I would consider a trigger job on a new B model.