I ran into this pricing a chevy duramax recently. On their site one can "build" a vehicle by customizing packages. I don't really know what this "build" process is for because at the end it just searches for dealers that have inventory with n out of x features one selected, or "request a quote" which is really the same thing. It's a very misleading process in my opinion.

Anyway... I tried removing OnStar and the only way I could do that was to remove all the feaures I wanted and also needed. e.g. towing package, bigger engine, etc... The only way I could "build" one without Onstar was to have a bare-bones model with nothing else added. Ill try again in 5 years or so.