Negotiating the price of a tractor is similar to buying a car. Do a little research on the model of tractor you are interested in before. Get brochures, ask other owners, and determine what you want to do and on how much land to arrive at what tractor suits you the best. Like a car, a tractor that is great for one person may not suit the needs of another. A great place to start is reviewing the TBN archives by doing a search.
Tractor prices are negotiable but determining dealer cost is much more difficult to find. See what others on TBN have paid for same make and model. Prices may differ from one area of the country to another. Like cars, price is influenced by make and model, time of year, new models coming out soon, number of tractors on lot, options on the tractor, dealer's reputation, overall demand, competition, etc. If possible check out 2 or 3 different dealers and compare. Good luck in your adventure!