Since my grocery budget is small I try to cut costs wherever I can. We try to eat salad at lunch and dinner so I always put my veggies into the plastic bags provided by the grocery store. I always try to buy bulk meat when I can.
When I get home I put away the veggies and then cut the hamburger into one pound blocks, I put one piece into the bag and press all the air out of it, tie a knot and then add another piece, tie a knot and one more pound can fit and then tie a knot. When needed cut the bag below the knot so the rest of the bag is still intact. This has really helped with the food bill.
I also save by cooking items from scratch, such as beans. I use my pressure cooker to cook them and that saves time. I make my own tortillas too. For the same amount you pay for 10 tortillas I can make about 30. Freeze them too. Hope this helps someone.