Pep Boys? Hmmmmmmmm, that could be an adventure! Good luck if you have to ask them where they have them. If they've got an area for automotive fasteners/hardware, it is possible, probably a blister pack of 2 or 4. The auto paint store would be more economical for a significant quantity.

BTW, the xmas trees make the panel removeable also, just pry them out along with the panel.