Sonic: Half-Price Blasts All Day Long (7/27) July 26th, 2016 By Nicole This post may contain affiliate links, which means I will make a small commission if you click and make a purchase. Woohoo! Sonic is offering Half-Price Blasts all day long tomorrow (7/27). You can score up to five. There is no coupon needed to get this deal, simply mention the offer when ordering. (You may want to call your local Sonic to make sure they are participating before you head out). Yummy!