Instead of planning my menus and then going shopping, I check the store ads. Boneless, skinless chicken breasts on sale? That'll make some meals this week. Grapes and bananas down in price? Chalk them up for fruit choices! Healthy eating can work fine in a budget.
I also watch for unadvertised specials, particularly in the produce aisle. Sometimes, sales don't meet expectations, and to avoid loss, management will provide drastic markdowns. Asparagus for $1.99 a pound? Gotta love it!