Right now if you download the Sonic App and order through it you have two really great perks:
Happy Hour Any Time: Get ½ Price Drinks and Slushes Every Time You Order Ahead in the SONIC® App. Includes Soft Drinks, Iced Teas, regular Lemonades and Limeades, Frozen Lemonades and Limeades, Ocean Water® and Famous, Real Fruit and Candy Slushes. Add-Ins cost extra. Excludes Mini size, Ice Cream Slushes, Combos, Wacky Pack® Kids Meals and other offers.
Valid for one free medium Tots with purchase using when you order in the SONIC® App. Add-Ons cost extra. One per customer. Not good in conjunction with any other offers or rewards. Reward is valid through January 31, 2020 at participating SONIC® Drive-Ins.