The best way is to get a good deal on the car when you buy it.
If you go over to the subaru forester forums there is probably a long thread about what people are paying for these cars. The gist of it is going to be something below invoice price by around 3 to 5% (generally). Go to
www.truecar.com and price out the car, it will show you the invoice price.
There are not likely to be 2016s left over as 2018s are coming out soon. Where do you live? There are plenty of dealers who will drive 2+ hours to you to deliver a car to your door for your business. Finding one should really be a non-issue if you look a little beyond your immediate area. There is no real need for you to ever step foot in a dealership although buying locally can sometimes give you some benefits like a few free oil changes or inspections.
By the way, the 6spd forester is a great choice and a rarity in this day from any car manufacturer, but Subaru makes plenty of them . I had to concede to an CVT Outback for the bigger size.