2021 GMC Terrain Price: $27,200 San Antonio, TX More San Antonio, TX GMC Terrain's 2020 $17,895 75,605 Miles 2019 $24,000 71,196 Miles 2017 $20,981 43,175 Miles 2017 $19,911 66,088 Miles 2014 $11,999 115,489 Miles 2016 $17,981 69,175 Miles