Shop in season- Most in season produce will be cheaper than when they are out of season. You can stock up on veggies and freeze them for when they are out of stock.
Buy in bulk or frozen- Frozen veggies can last for awhile while keeping their nutritional value. Grains or nuts can be bought in bulk to last for some time to make foods from scratch.
Find sales and coupons- Coupons can give you good deals on different foods. Many grocery stores now have apps to make couponing and weekly sales easier to find.
Meal planning- Planning allows you to make a list of ingredients to stick to and ingredients that can be used in multiple meals.
Secret: It is possible to eat healthy on a budget. Just takes knowing what to look for.