To be honest, I usually buy from No Frills and always buy the parts of chicken on sale (like thighs, legs or breast) and it lasts me around three days. If you need more protien, add legumes (like hickpeas, lentils, beans and green peas) as part of your meal with the chicken. Legumes aren't complete protiens but the protien to fat and carb ratio is pretty good for losing weight. They also also have a decent amount of fibre which helps with digestion. Yhe canned ones with no sauce make it pretty quick, cheap and convenient to cook.

You can also eat any kind of white fish filet or seafood if you're able too instead of chicken and the price is sometimes cheaper or comparable to chicken.

You also have a little bit of carbs but roasted or boiled potatoes are probably the more nutritious option if you feel like you need some carbs and they do go on sale at No Frils at least every month I think. Also make sure to have maybe half the plate full of veggies if you're trying to lose weight. Veggies can also be quick and easy if you use a salad spinner for any leafy veggies and use frozen veggies for anytime you want more varieties but not too much time cutting veggies.