Just when you needed a little pick me up… Here comes Red Bull slushes Tomorrow, Sonic will introduce the Red Bull Slush and it’s sure to take your day drinking to a whole new level. If you’re not a fan of the taste of an energy drink, Sonic will also offer a Cherry Limeade Red Bull Slush. The drinks will range in price from $2.99 to $4.99 depending on what size you choose, and yes there is a size with an entire can of Red Bull inside. The Red Bull concoction will only be available through June, and they will be a part of Sonic’s Half-Price Happy Hour promotion.