FREE: Slush at Sonic (w/ App Download) April 27, 2016 By: Tricie share Score a FREE Sonic Slush with the Sonic app! Download it for Apple and Android and you can also check out their commercial HERE! Pay Full Price… For What?!?! Be sure to find me on Facebook and “LIKE” the Page! Please be advised that this post may contain affiliate links. See my Disclosure Policy for details.