Audi A8. Find Your Car: Audi A8 Listings Near Houston, TX 77094. 2011 Audi A8 L 4.2 quattro, $73,992. 2011 Audi A8 L 4.2 quattro, $78,493. Used Audi A8 - in 77001. 2012 Audi A8 L 4.2 quattro, $81,502. 2012 Audi A8. 2013 Audi A8. 2012 Audi A8 > Audi of America.