Pay special attention to the days of the week the sale prices are in effect. For example some stores have no sale prices in effect on Mondays, traditionally a busy shopping day. Carefully plan purchases, noting on the list which items are sale priced and items where a coupon can be used. Always spend cash. Take time to get cash before going to the store.
Nothing impacts our mind like taking cash from our wallet or purse.
Many people who use credit cards rarely know how much was actually spent - until the statement comes. Many people who write checks simply do not take the time to calculate the balance and have no idea what is left over. Paying cash causes us to think ahead. Take advantage of coupons and rebates, they do add up. Shop at stores that doubles coupons and take the time to watch the papers for grocery coupons.