Sorry for the delay! Was there a particular model of Audi you were looking for? Most of the Audi listings currently listed in the marketplace are various parts posted by individual sellers.
You can narrow down your search results by filtering by tag. Go to the Audi section, and under the "Tags" field, you can type a tag (e.g. "s4", "b8").
Alternatively, you can visit the Audi Cars section and follow the tag for email updates; however, sellers would have had to tag their listings accordingly for their listings to show up in that section. Our community team actively checks newly listed items in the marketplace to make sure tags are uniform across the marketplace.
Hope that helps!