You haven't said what factory or dealer installed accessories this TEP includes. The accessories you get will affect the price. Often the Premium has a lot of other accessories already included because people who buy them want that stuff.
Go to the Toyota website and do an online build of the car you want. You can see what all of these extras cost. Some of the websites listed below and others will also show you the invoice price of the car and all the accessories.
There are 3 ways I know of to get a lower price on a 4Runner. Someone mentioned Truecar.com above. There's also Cars.com. One of these sites will show you all the 4Runners available within a specified distance of your town with MSRP or asking price listed. You can contact any of them to see what they'd sell that T4R for. If you're a member of AAA you can ask them to put you in touch with dealers who will offer a AAA discount. Costco had the lowest prices when I bought my TE in June, 2015. I had to deal with one particular dealer here in the Los Angeles market but it was worth it. That gave me a price of $800 off of invoice price.
All of these discount prices, except maybe the Costco price, will give you some info to negotiate with.
You can ask for prices on cars that dealers may not have on the lot. If dealers try to find the car you want they will find the same car you're considering right now and try to trade for it with that dealer. You can muddy the waters doing that. You can ask for prices on a special order from Japan. You have to wait 8 to 12 weeks for delivery, but by asking to order the one you want allows you to get a price without having to find the exact car in your area.