Enterprise Car Sales 2550 Monument Blvd, Concord, CA94520 Enterprise Car Sales offers previously-owned automobiles. From cars and trucks to SUVs and vans, there are many models…More available. This dealer offers Blue Book trade-in value on vehicles and tops it with a $500 rebate toward purchase. There's no haggle pricing with vehicle certifications. Other services include a 12/12 limited powertrain warranty with 12-month roadside assistance. Free Carfax reports are also offered and trade-ins are welcome.