Chill out on the first day of summer, Wednesday, June 20, 2012, with 1/2 price shakes at Sonic all day long. This really makes them an affordable treat!
This deal is available at participating locations, and the hours may vary by location. See the Facebook event page here: https://www.facebook.com/events/172950699501616
Also, you can get 1/2 price shakes at Sonic every day this summer after 8 p.m.