Where I live we have a discount supermarket called 'Aldi' nearby. I recommend people look it up to see if there's one near them. It is SO much cheaper than the regular supermarket, food quality is still great (just not name brand stuff) I usually get everything I need for the week for about $25-30.
Example: A regular supermarket may charge $3 for a box of store brand cereal. At Aldi most boxes of cereal are $1.50-$2.
Aldis is great for shopping without coupons. However, shopping with coupons while the item being on sale can't be beaten. The price is often better when using coupons. Not always. Do not use coupons just because you have a coupon. Use it when that item is also on sale to get the best price! :)