Looking for Sonic deals and freebies? Then keep reading! The List has rounded up eight specials – including Sonic Happy Hour prices – to enjoy throughout the week.   1. Free Sonic Drink or Slush   Download the Sonic app and receive a free medium soft drink or Famous Slush just for signing up. Click … Continue reading Sonic Deals: 8 Sonic Happy Hour Food Deals, Drink Freebies & More