Most dealerships need to make 5 to 6 grand per truck so a lot depends on what the factory charged them for it and what incentives they got from other suppliers (i.e. Bridgestone would give the dealer a rebate for specing it with a certain one of their tires). There is a lot of this that goes on and it's almost impossible to find out. A good sign is if your sales guy who told you Fontaine fifth wheels were the best for the last 3 trucks suddenly tells you Hollands are the best or something like that.
A reasonable spec Cascadia tractor with a Detroit engine, 10 speed and Freightliner axles should be under 120,000.
The last ones I did for a fleet came in at 113,000 but they were fleet trucks and we did 10 of them. A similar spec'd Pro-star came in at 106,000 but it is just not the truck that the FL is.
Keep in mind the above prices were for fleet trucks and even a small change in specs can have a HUGE difference in the price.