We can get 44 units in Australia from Adafruit. If you order today, we can dispatch this stock between Sep 24, 2020 - Sep 27, 2020.
Plastic wheel with a cutout specially designed to allow attachment to our larger continuous rotation servo. Makes it easy to get your robot rolling. Each wheel comes with a rubber tire that is quite sturdy. To attach, just remove the horn from your servo, align the splined gear, and use the small screw that came with your servo to attach permanently
You'll probably want to get 2 or more.