So how does the Fat Mum Slim blogger do it? Firstly, she targets the specials in grocery catalogues and plans her weekly meals around the items she can get on special.
"I start out by looking at the specials for the week, so I know what I'm working with, and then I have a meal plan sheet that I work from," she said.
"I write out what ingredients we need, what I already have in the pantry, and then create a list from there."
One tip was to look for the food items that are on special due to their odd shape or items on clearance.
Often supermarkets will have drop prices on oddly shaped fruits and vegetables that may not look as appealing but share the same flavour.
Another of Ellem's magic tips is to leave the kids at home and only go shopping when you're not hungry.
"You can also avoid overspending by shopping without the kids, making sure you shop on a full tummy, and by shopping to a list without straying from it."
The mother of two says your pantry should always be stocked with food such as pasta, rice and tomato puree as they are cheap and easy ways to bulk up a meal for little cost.
Pasta and spaghetti can be as cheap as $1 which can be the base of delicious meals.
She added that it's better to incorporate fruit and vegetables that are in season as they tend to be cheaper.
When it comes to lunches she makes them in bulk at home, her go-tos being meatballs with a salad or soups for herself and her husband.
"It's all about balance, when feeding a family. You'll notice that the Vegemite pasta doesn't have a vegetable in sight, but it's one of those meals that you throw together and know the kids will eat," she said.
But the biggest change she's made was deciding to online shop instead of physically walking into the supermarket.
Ellem believes shopping online reduces the chances of impulse buying and forces you to stick to your shopping list.
Chantelle's grocery saving tips
• Meal plan. I always save when I'm organised.
• Shopping when I'm not hungry.
• Using my grocery rewards card
• Shop online. Without a doubt, when I shop online I spend less.
• Grab something from the Odd Bunch.
• Shop solo. I'm a sucker for giving in to my kids.
• Pick and choose. There are some things I like to spend more on (cuts of meat, the best hams from the deli, and local milks).