Those web sites I put up have had many of those rigs on for months and months. Just use that asking price as a very very rough guide. Here's another place that has a bunch of trucks: http://www.eldoradotrailersales.com/
They don't even put their prices on their site. In Wisconsin tho so you should take a drive there and see if anything looks good to you. I've stopped there and they have a nice selection of high end units.
'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio