1/2 Price Cones at SONIC TodayToday only, July 9, SONIC Drive-In is offering half-price ice-cream cones all day long. No coupon is needed – simply stop by and get your discount! The special is good on regular ice cream cones, waffle cones and waffle cone sundaes. Prices, of course, may vary from location to location, but here are the regular (before-discount) prices at my SONIC: Waffle Cone Sundaes $2.99, Vanilla Waffle Cone $1.99, Vanilla Cone $1.