Got it from a dealership? Know any places that have good deals going regularly? I'm saving up for a down payment on one.
If you're going to lease or buy just do these steps
1. keep an eye on the official Nissan Maxima thread at Edmunds.
2. Join a Maxima forum.
3. See what deals people are getting. That's where #1 and #2 come in. Find the lowest/best deal possible. You'll definitely see some on there that are too good to be true, because they probably are. A lot of people like to fake flex their negotiating skills. Use your brain to weed those out.
4. Get a list of dealers a) in your state b) in neighboring states c) around the country. Also get referrals from the forum members if possible (that's how I bought my M2 that I got coming)
5. Email 5-7 in state, 3-5 in your region, and 1-3 out of state. Tell them that you've been offered x, y, and z from ________ dealership. Can they match it or beat it. Send them that best possible deal you found. If you're leasing make sure you send Money Factor, Cap Cost, and all other lease terms (see #3). If you're buying you obviously want to pay invoice or something above that (see #3). Don't leave them any room to change up the deal. Send them EVERYTHING (again, see #3)
Eventually you'll get a dealership to beat or match the best deal. If they are out of the state enjoy the ride back or have them ship it to the nearest Nissan dealership for you. This is the method I use. I paid less monthly on my fully loaded $63k GS350 F-Sport than most people pay on Camry's.
Another thing you might want to try is the Costco, American Express, or your local credit unions "Car buying program". I'm sure there are others out there. This is the best way to get relatively close to invoice.