Purchasing an Auto

I have lived/worked on and off in Argentina since 1992 but have never been subjected to the process of purchasing an auto either new or used there. What I have observed however is there are no parallels to the infamous U.S. industry. There appears to be little or no bargaining, no hasseling, or more simply put "pay the stated price of you want the vehicle". Obtaining information regarding vehicle ownership, what is required in taxation, system of evaluation, required insurance (liability, med payments, property damage, etc.) from anyone including banks is an experience in futility. I am new to this as my previous vehicles were provided by employer. I drove throughout Argentina from Cape Horn to the Bolivian frontier with only my U.S. issued, state drivers license. It probably would have been more legal had I had an Argentine license but never saw the need for one. Everytime I crossed a provincial line I was always asked for proof of registration, insurance credentials and my carnet de choufer (drivers license), in that case, my U.S. issued model. I was never refused crossing or questioned as to why I did not have an Argentine license. I remember one time when entering Tucuman I presented all the documents to a state cop including my state drivers license. He reviewed all my documents including drivers license then returned all to me and said "we do not accept your state's drivers license, only those from California". It took me a few seconds to understand the meaning of his statement and I then returned my license again to him with a ten peso note. He said, Excuse me senior, I made a mistake, your carnet is from California, passe". Back to my request: Anyone recently purchase a new auto and if so, were you able to negotiate the price? Or, a used one from a dealer? Did an Argentine bank arrange the money transfer to the dealer or how was he paid? What about the tramities for the license plate and various user fees/taxes?