I think your best bet is to build the L47 it exactly as you want it on the website. Print out that sheet with the total MSRP. I would subtract 12% off that and use it as my target. Then I would go talk to each dealer. Have a conversation with the sales guy. Talk about your needs and what your looking for. Ask about service and warranty work. Ask if they will deliver the machine, and give you a thorough walk through on how to use everything. (That is a great opportunity to function check everything before technically taking possession). Find out if they will pick the machine up for service or warranty work. Maybe you have a trailer, either way it is a good opportunity to build a relationship with the dealer and see who you are most comfortable working with.
After this meeting, get a quote and ask for their best price. You can always let them know you sent for some more quotes, but you value the relationship with your local dealer, and reassure them it is important to you.
You should get a good quote at this point. Hopefully in the 10% off range. Then compare all quotes and decide which dealer you had the strongest connection with and how convenient thy are to your location. If you have a lower quote, take that in and use it to tray and get them down just a little more. Just remember they have to make money too. You don't want to be too unrealistic on getting a deal. The closer you get to 15% off, the more unlikely you will get freebies included in your price. Things like grease, filters, 50 hr service, etc.
Be patient for the best price. You will always pay more if you rush it. Enjoy the whole process. getting your new tractor delivered will make it all worth it! Keep us posted.