Bananas how do I check inventory on Mazda's website? I assume you mean Mazdausa.com? Appreciate your help!
cars.com is pretty up-to-date. I filtered by drivetrain and trim when I was searching for mine.
As for mazdausa.com, just go to the CX-3 page and build your car. All you really need to put in is your trim and drivetrain. Grand Touring FWD for you, right? Once you get to page 5, the Summary page, click "Search Inventory." I got No Results a million times, so just click "Expand Search Radius," put in your zip code and do like 250 miles to get the largest range. It'll show the interior/exterior colors and MSRP so you can kind of guess what other options/packages are included with the car. Then I would just go to that dealership's website to get more info on the car, and reach out to them for a quote if I wanted to.
You can then refine your search by trim and color at the top and sort by distance to find the ones nearest to you. This helped a lot for me, since I was so specific in what I wanted. The closest one I wanted was two hours away, but I did end up making that drive to get it. It was worth it

Hope this helps!