Plan your weekly meals around what's on sale in the grocery store's ad. Not by what you want to make. We see what meat's are on sale each week (meat being the most expensive thing we buy) and stock up on those meats. Ground beef on sale? Well then it's burgers, meatloaf, tacos and burgers for that week.
We also eat whatever veggies and fruits are on sale each week. Kids want pears but apples are on sale that week? Then apples it is and the kids will just have to wait to have pears when a sale rolls around.