$0.50 Corn Dogs at Sonic Jan. 20You’ll love the current Hot Deals, sorry you missed this deal. Tuesday, January 20 is Best Friends Day and Sonic is celebrating with $0.50 Corn Dogs all day! Plus, don’t forget 1/2 price drinks from 2-4 pm everyday. $0.50 corn dog day is one of the busiest days at my local Sonic. As always it’s a good idea to double check with your local SONIC Drive-In for participation.