
SONIC Happy Hour 1/2 price drinks from 2-5pm EVERY DAY. My favorite is the Cherry Limeade with extra cherry and extra lime. (I also like the Cherry Lime Slush.)
SONIC 1/2 price Shakes after 8 pm. I like this one because UNLIKE MANY other chain restaurants, they use REAL ICE CREAM! (It REALLY bothers me that so many Ice Cream treats are now "Frozen Dairy Desserts". That means they are NOT Ice Cream.)

Taco Bell. "Happier Hour" between 2-5pm, $1 small freeze drinks, or regular drinks. I like the Baja Blast. But the Starbust flavored freezes are really good. and the Orange Vanilla Crush looks pretty good, but I haven't tried it yet.
Right now if you apply for a FREE Maverik Adventure Club Card at ANY location, you can get an XL soda for $1. ANY DAY, ANY TIME, ANY LOCATION.
If you're a SODA freak, this is nice if you are out and about all day.
Culver's has about 8 or 9 "SnackPak" Meal Deals, all for around $5. They include a small drink and small fries, but it is a complete meal for me, and their BURGERS (Called BUTTERBURGERS) are the best Fast Food Burgers money can buy. If you've never had a butterburger, may I suggest giving them a whirl.
They also have "Kids Meals" ALL of which INCLUDE a kids size Frozen Custard.
Also, check the "Flavor of the Day" for the location nearest you, and plan your visits according to your favorite flavors. My families favorite flavor is "Just Drummy." But there are SO MANY GREAT FLAVORS... Turtle, Double Marshmallow Oreo, Chocolate Oreo Volcano, Cherry Chocolate Chip, Caramel Cashew.
And here is a little known tip about the "Flavor of the day." For Kids size, you can add 1 extra "Mix-In", and for larger sizes, you can ADD 2 ADDITIONAL "Mix-Ins." at no additional charge! So my suggestion is to get the "Flavor of the Day" with 2 "Mix-Ins." when you go.
As I find more deals I will post them. I will also try to keep this as up to date as possible. Happy eating, drinking and snacking!