I am looking for cruise for my car also. If that is for the electronic interface and installation, I think it is a good price.
Years ago I got one of those crappy units from Autobarn with the magnets and had someone fit it. About $200 for the unit and $200 for fitting (onsite).
In describing it as crappy, it worked OK except where the installer was careless with the layout of the cable. On 3/4 - full throttle, there was enough play to catch the cable around some part and hold it there. So when you came off the accelerator and changed gear the thing would blow red-line. Mods on my part rectified that though.