Here are some specific tips on how to save money and still buy healthy food

• Cut the junk. Evaluate how much money you are spending on items such as soda (regular or diet), cookies, crackers, prepackaged meals, processed foods, etc. Limit or completely cut out these unhealthy foods. Your wallet and your body will thank you.
• Eat out less. Even just reducing your meals out by 1 or 2 times per week can save you about $15 – $25 per week. This is an easy way to save money and even have some extra to spend on higher quality foods.
• Stick to your grocery list. The more prepared you are when you get to the store the less impulse purchases you will make. So write out a grocery list and stick to it!
• Shop the perimeter of the store first. This way you will fill your cart with healthy whole foods like fresh produce and meat, leaving less room for the “junk food fillers” and thus saving money.
• Cook large portions. It saves time to cook once and eat multiple times. One idea is to make a big pot of soup at the beginning of the week or whenever you go food shopping. When you don’t feel like cooking, help yourself to a hearty bowlful along with a green salad. This makes a nutritious but inexpensive lunch or dinner anytime.
• Beware of hidden sugars. Many packaged or processed foods contain high levels of hidden sugar. They may be easy to prepare and fill your family up for cheap, but too much sugar causes rapid swings in energy and blood sugar, and can contribute to many serious health problems. Hidden sugar may be listed as corn syrup, molasses, brown rice syrup, cane juice, fructose, dextrose, or maltose. Avoid foods such as instant mashed potatoes, white bread, canned soups and vegetables, refined pasta, and sugary cereals. Satisfy your sweet tooth with naturally sweet food such as fruit, peppers, and sweet potatoes.

For more tips, please see http://www.helpguide.org/life/healthy_eating_on_budget.htm