I just bought an Acura for the wife last month. Got out the door under $40k on a vehicle that has a $39.5k MSRP and included $2.5k of dealer add-on accessories and sales tax.
Here's how I worked my deal:
1. Go to Truecar.com and find out what the invoice is on the model you want (this is the most you should pay for the base vehicle, this is where the negotiation should start).
2. Go to a dealer and test drive and get a quote. Right here I explained that I knew what the invoice was. The dealer even pulled up Truecar.com and agreed with the invoice and included the invoice price as the quote. With Acura, all vehicles come base and the accessories are purchased and installed at the dealer, so at this point you have to decide what accessories (roof rails, running boards, splash guards, etc.). Pick them and let dealer add to the quote. Also, I told them I knew what my KBB trade value for our trade in was so please dont low ball me. When they came back, they had matched that number ($12K) which I thought was very fair considering the car needed some maintenance.
3. Leave the dealership without committing to anything (very important).
4. Email all dealerships within a driving radius (around 5 more for me here in Atlanta) for quotes. Provide them the exact model & accessories you are looking at. This is where the fun begins. Tip: Try not to get on the phone with these guys (they try hard to get you to come to the dealership). Keep it on email and keep it straight. They try to trick you by moving numbers around and leaving out things on their quote. Sometimes you have to relist all the prices on their quote and send back to them and ask them if is all and the price is the 'out the door price.' They know they are bound by the email, so you have to get it confirmed. More than once they had to requote me b/c something was 'left out.' They try to give you a low offer that is not all inclusive to get you in the door.
5. Through lots of email haggling (you're going to need a spreadsheet), I was able to get to a final quote $500 below invoice with $2.5K of accessories for around $2k.
6. Go back to original dealership (in my case my wife wanted to buy from a particular salesman) and show them what you have. The dealership beat the quote by $300 not lose the sale.
7. One other piece of info was that I found out the 'protection package' for $895 could be purchased piecemeal from Acura parts for around $350. After getting them to beat the quote, I then told them just to take it off the car. This killed $600 in profit they were counting on to make up for the below invoice price (you could detect some concern at this point). Even better is they decided to just leave it on the car (wheel locks, all season mats, and trunk mat) rather than strip the car when it was delivered, so we got it for free (reducing my $2k quote on accessories to $1.1k so that we got a list price $2.5k of accessories for $1.1k).
8. At closing, I balked at the $800 in document fees and said no deal. The F&I guy added $500 to my trade to close the deal.
9. The dealership also got us 1.9% financing through Wells Fargo. Acura wasnt running any financing deals on the brand new 2015 models yet. I told the dealership early on if we couldnt get around 2% financing, we were going to hold out until Acura offered better financing. In fact, there were no dealer incentives on this model that I could locate online as I would have included those in the negotiations too.
It was a lot of work to keep the quotes straight and haggling over the course of about 10 days, but in the end, I think we got a pretty good deal for a new model Acura right off the truck from the factory. I saved around $5k off of retail prices, but in reality, I probably saved an additional $2k off what the dealership would have sold me the car for on the first day.
My wife was like the first poster on here that gets worn out with all this and wanted me to stop being so cheap. I like it though, so until I am able to get me a money tree that grows $100 bills or win the Powerball, $2k is worth haggling over.