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Starting Monday, April 21, Sonic is giving the first 1 million people who order the Double Sonic Smasher through the Sonic App an exclusive reward to purchase the cheeseburger for just $1. To get this burger for $1, you’ll need to download the Sonic app, and hit the “Deals” tab to locate and redeem the $1 Double Sonic Smasher reward. As long as you’re within the first million customers, you should be all set. The reward is only valid for a one-time purchase and ends either when the brand hits that million-customer mark or on April 27, whichever comes first.