We charge $250 for a standard remote Vicidial installation. We haven't installed "in person" since our last trip to northern Florida several months ago. We are in Upstate NY.
90% of our installs are remote client installs, the other 10% are local in our colocation facility. We have a standardized installation method, of course.
Also of note: After you've installed Vicidial, you really have no further need for Trixbox unless you have several "non-sales" users who enjoy the FreePBX interface (or if you are using HUD or other features for non-sales personnel extensively).