Post-market stereo for 2003 Corolla

When it comes to purchasing an aftermarket stereo for my 2003 Toyota Corolla, I have to purchase the panel kit since the factory stereo is I think a Double DIN. I was wondering if any of you could find and/or recommend me a vendor (whether online or not) that has that panel kit.

Plus I live in Toronto, ON and if you could find me a vendor at or near Toronto, that will be great.

It's just that I'm looking to acquire a Pioneer DEH-P7600MP stereo.