Tips for eating healthy/ meal prep

I'm trying to eat healthier without breaking the bank. Are their foods or products that help you meal prep that aren't super expensive? I saw at Walmart had pre- cooked chicken breast & steak strips so they can be microwaved. For example, are the bagged salads worth the extra expense because you eat more salads than prepping them yourself? I think time prepping/ cooking meals is my downfall. And, trying to keep costs reasonable. If there's any foods or products that you swear by to help you eat healthy, I'm all ears. My goal is to try to fill my plate with half veggies. I usually have a homemade protein powder/ fruit smoothie for breakfast each day. ETA: Or any foods or cooking tools that have been game-changers for you to help you eat healthy?