Out and about today ?  Enjoy Medium Sonic Slushes for $0.79 today only, at participating locations.  No coupons are required - just mention the Medium Slushes Sale when you order. Tax not included. Add-Ins cost extra. Limit 4. Excludes Real Ice Cream Slushes. Cannot be combined with other offers, including Happy Hour. Offer valid 8/19/15 [...]