Question: are sonic master shakes half price?
Answer: Half-Price Shakes After 8 p.m. are Back at Sonic. The Sonic Nights deal ends Monday, September 2. Half-price Shakes after 8 p.m. are officially back at Sonic Drive-In. Stop by to try a thick and creamy Hand-Mixed Master Shake or Classic Shake in a variety of flavors for an unbeatable price.