You can go to
New Car Prices | Used Car Values - Official Kelley Blue Book Site and price your new Matrix out with whatever options you want and see what the dealer invoice is on the car too.
Keep in mind that Toyota dealers also pay a 3% factory holdback on each car, so even if they sell it for invoice, they still make 3% on the deal.
Don't accept any additional charges other than transportation, taxes and registration and relicensing fees.
Some dealers who are part of the Southeast Toyota network add extremely overcharged extras as a way to make even more in dealer profit.
The Matrix is neither a limited production, nor a high demand car, so any dealer should be able to get you whatever you want, without charging you a premium for it.
If you have a Carmax store near you, you might also consider them because they don't tack on all sorts of additional bogus charges, and you won't have to negotiate the price either.
They sell the car for the price they have it marked at, much like a loaf of bread.
I've purchased several cars from them and they are about as honest as a dealer gets.
Your closest Carmax NEW Toyota dealer is in Baltimore.
You can always use their selling price to help get your local dealer to accept a lower price.
Look at
www.carmax.com.
They show you up front what the list, and invoice costs are, plus what they are discounting it for.
Hope this helps.