How are the prices set, I see the sign about the different days but how does it work?

Appliance store

4700 R St, Lincoln, NE 68503, USA

Grocery store

1340 W O St, Lincoln, NE 68528, USA

Sports complex

1600 Court St, Lincoln, NE 68508, USA

Sports club

800 NW 56th St, Lincoln, NE 68528, USA

Pet store

200 N 66th St #209, Lincoln, NE 68505, USA

Federal credit union

4638 W St, Lincoln, NE 68503, USA

Credit union

501 N 46th St, Lincoln, NE 68503, USA

Archery range

4703 N 44th St, Lincoln, NE 68504, USA