Another strategy I like for groceries is walking to the store during my "lunch" break each day. It's never busy, you get used to the layout and can shop faster, it's easier to only choose ripe produce and to be selective with temporal price variations, it makes it easier to plan meals around produce that's ripening faster than you want, and you don't have the chore of dealing with a whole basket of groceries.

It still takes 2+ hours of work every week, but I was going to be walking or doing some sort of light exercise eventually anyway, and the mental break helps with focus on coding the second half of the day.