The shop I work for charges $25 to assemble a bike, this is a basic assembly. You would have to spend an additional $40 to get it fully tuned up, which it will need, even if it is brand new. I may work for one of the better shops, but ever wheel is trued, every cone is adjusted, and everything on a bike is adjusted to work properly.

A bike is easy to assemble if you are a professional mechanic, or if you have no idea how well a properly adjusted bike should feel.