Everytime I come here milk is a different price, usually 2.50 to 2.99 but sometimes as low as $2.19 a gallon. Is there any way to know which days it will be cheapest?

I just bought a gallon of milk at Publix for $4.29. They are always the least expensive overall

Theres actually no way to know unless you work there

One way is to know it is, it will be less than three dollars. Another way is when they are on overstock, AKA, not being bought fast enough. Everything else, I am not too sure.