It depends on how long you want them to last. If Toyota does it, it will be as long as they did this time, and your driving habits. Midas claims lifetime pads. I usually use the best brand they have @ Schucks or NAPA. Raybestos.
To change the brake pads on a 2006 Toyota Camry the car must be safely propped up. Remove the wheels and loosen the calipers. Slide the brake pads out and replace with the new parts. Repeat the process for all four wheels.
pads
The cheapest place to buy brake pads for a 2007 Toyota Camry is Pep Boys or Auto Zone.
I think that Camry disk brakes were very similar from 1990 to at least 1996, and I answered the question on changing brake pads for my 1995 Camry, so maybe that will help.
According to my research, brake pads for a '99 Toyota Camry are about $40. Remember that this is per brake pad. So, if you need all 4 replaced you could expect to spend at least $160 for parts.
Wagner brake pads are brake pads for a car/truck specifically from the brand Wagner. You can learn more about them at the official website www.wagnerbrakepads.com
$250.00 just for brake pads
depending on quality and warranty. 20 to 60 for front pads.
There is a video on how to do this at www.teach-me-auto.com.
Take the wheel off to see if you see a caliper for a disc brake or a drum for a drum brake.
You can usually find brake pads in most auto part sites but for the specific brand you're looking for I have managed to find you a site that would sell you brake pads for a 2001 Toyota Camry for 32.02. Just head over to the link I'm going to post and scroll down. http://www.autopartswarehouse.com/shop_parts/brake_pad_set/toyota/camry.html
It can be a sticky caliper or you need to change brake pads.