So instead, I made my own. I picked up some wooden wheels from the craft store which seemed to be the perfect size.
Once dry, I added some soft squishy felt to the backside (shaped to the wheel size) so that the wheel isn't banged directly against the wall.
Found a screw long enough to fit through the wheel and into the wall, and with a head large enough not to fit right through the wheel.
So, for the cost of about $2, since I had most of the supplies in stock, I made myself colorful and cute doorstops!