I have purchased Brake Kits from Amazon with no problems.
I'm looking at these for my mexico built Mazda 3
Power Stop KOE6973 Front and Rear Stock Replacement Brake Kit or
Full Kit eLine Diamond Slotted Brake Rotors & Ceramic Brake Pads CES.80014.02
Make sure you get the ones that fit you car (Japan or Mexico built) as they are different.
I know the Power Stop brand is good as i have a set of drilled/slotted rotors in my Nissan Frontier though i did need to replace the rear set after a few year they stop you fast.
After learning about some issues with cross drilled rotor I will not be buying them again just slotted and coated rotors for me.