All of the below are found at your local grocery store and may be bought all in one trip, saving gasoline money.

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Pick up a weekly circular every chance you get and plan your shopping BEFORE shopping.
Many of the below are sold in off-brand names, saving a little change.
Use coupons to stack up on top of sales. A good way of obtaining coupons is by leaving a coupon box at your local library and/or church...One person's trash is another person's treasure.
Good For You Cheap Foods Include:
An easy way to get your omega-3's. Use with mayonnaise and diced onion for a quick sandwich.
An easy way to get your protein. Spread on English muffin, bread, bagel or tortilla wrap.
Full of calcium and protein, it can stretch a meal.
Instead of buying boxes of cereal, I use it with diet shake drink mixes to get daily nutrients, such as Slim Fast.
Some protein and good when in a hurry. Scramble with veggies or place on an English muffin or bagel with a slice of cheese.
Add a can of peas and some scrambled eggs with a dash of soy sauce for a quick fried rice.
Add water to it for a vegetable soup broth. Use plain with spices for marinara with pasta.
Use with a few vegetables, red wine vinegar, canola oil, salt and pepper.
Heads of lettuce usually cost 99 cents each where bags tend to be costly.
Saute in butter and stir in cooked egg noodles. Maybe, even stir in a can of sliced carrots.
Make coleslaw with shopped and shredded cabbage and mayonnaise with a sprinkling of paprika.
Maked baked potatoes.
Make potato salad with the skin on to get all of the nutrients.
A good crockpot recipe? Throw in chunks of potatoes (skin on), coin-size pieces of kielbasa, vinegar, water, sugar, oregano and pepper then stir. Leave on HIGH 4 hours. Voila! A cheap and healthy dinner to pair with just about anything.
Use as side dishes.
Make vegetable soup.
Use with pasta salad.
Add diced onion and mayonnaise for sandwiches.
Comes in basically every shape and size to use with spaghetti sauce.
Also, use with vegetables and dressing with a sprinkling of Salad Supreme seasoning for pasta salad.
If the grocery money runs out, you will surely have a few of these items to lean on. Do what is called a "Pantry Challenge". Take all of the ingredients out of your cupboards and fridge and be creative! For example:
1 Soup (I use the Ramen noodle seasoning packet with 3 cups of water)
1 Pasta (I use Ramen noodles)
1 Vegetable (such as a can of corn or green beans, etc.)
1 Meat (such as canned tuna, canned chicken breast, etc.)
Place in large skillet and bring to a boil.
Cover.
Simmer for 30 minutes.
Serve!
If you hit a really huge bargain, buy it in bulk (and do without a few other things), then create a pantry storage somewhere in your house for just those items to have when in need.
Another good thing about scouring those grocery store aisles? You get in your activity, whether by walking, pushing, lifting, etc.
Have fun!