2012 Buick Regal GS -  Price,Photos,Features, specifications & Launch   MSRP               $34,450 Invoice        $33,072 The 2012 Regal is a 4-door, 5-passenger sports sedan, available in 7 trims, ranging from the Base to the GS. Upon introduction, the Base is equipped with a standard 2.4-liter, I4, 182-horsepower engine. A 6-speed [...]