Just takes some good old fashion haggling. :thumbsup:
First thing you need to know is what retail cost is, and about what the most off retail you could expect. Depending on the size to the tractor, could be around 15% off. If the price is still higher than you want tell the dealer you've called around other dealers and you know you can get it for $X price. If they aren't willing to come down much on price then you start seeing if they will throw in different options or attachments to make the deal better. If they won't, then I'll walk out, or at least start to. Often this gets their attention and they'll be willing to negotiate more. If not head to another dealer and see what they will do for you.
With that said, when I am looking to purchase a tractor or other large piece of equipment I'll call every dealer within 100mi. I'll first talk to them over the phone to feel them out on their pricing. Say something like: "I'm in the market for xx piece of equipment, probably buying within the next day or two. Do you have any of that model in stock? What's your best price if I showed up with cash in hand tomorrow?" etc. Generally they know I'm pretty serious and will give a good price, if they tell me something close to list price I move on to the next on the list. If several have a good, low price that is similar I'll pick which ever dealer is closest, or which ever I like to work with the most.