I got(or will have in a week) my GS FWD for about $28,600 before taxes from Achilles Mazda up in Milton. That includes freight and pdi and whatever other charges Ontario requires. That was my best bid using Unhaggle and from what I gather it was about 1%-1.5% above dealer's cost.
If you go, ask for Achilles, I'm pretty sure he's the owner and tell him Victor referred you. I haven't dealt with them in person but the finance and sales part of it was very friendly and haven't run into any troubles or complaints.
Good luck!
Also, stay the heck away from Budd's Mazda in Oakville, gave me a good price on the GS AWD demo they had then went back on it saying they never mentioned in.
You did very good! I picked up the same model for $29,249 everything in except HST (tax), color was white so price includes the $200 extra. I also negotiated some accessories and they threw in all season mats and wheel locks, a $225 value.