When I separated from my husband and was left with three children, I had no income apart from the pension. Food was getting very scarce, so I had to become creative. Every second week I drove to Flemington fruit and vegetable markets in Sydney (about closing time when most food is the cheapest), bought food by the boxes, and spent the whole day processing it. I made vegetable lasagnes, which I would freeze, all sorts of sauces, vegetable selections for stir frying and steaming, mango ice blocks (pureed mango only) and so on. We would use the most perishable fruit and vegetables the first week and the others later. Eventually we started to have an overabundance of food.

Then I told a few friends of my system, and very soon I was running a little co-op. I started to go to the markets every week and buy a greater variety of food. I got my fruit and vegies free and could also split up my petrol bill for the week amongst participants of the co-op. They got their food much cheaper than in the shop, and I got my food and petrol free.

Apart from that we had the freshest food, with fresh fruit or vegetable juices every day. Out the window went fizzy drinks and any convenience foods. It is now about 14 years since we started to eat like this, and we don't even have a family doctor, because we hardly ever get sick. How much we saved on medicines I cannot even begin to calculate.

I recently noticed my elderly neighbour was unwell and no longer able to drive or leave the house; relying on taxi services to deliver food (often expensive pre-packaged items), or he would have home delivered takeaways. Being a fussy eater, he was reluctant to consider 'Meals on Wheels', so I volunteered to shop for him and cook him three different meals a week. Each week he gives me enough money to cover the costs of his meals (soups/stews/freezable casseroles) and I make up bulk amounts of each dish. I deliver half to him and keep half for myself, as suggested by him for payment. Not only is he saving money on taxis and home delivery, but he is eating healthy food and my family is also provided with three meals a week as a bonus for giving up a little of my time. Often cooking for one is not inviting, but cooking for others encourages healthier eating habits and helps regain social contact. Often a lonely person will gain a new lease on life to boot. A great savings all round, and using recipes from the Vault saves me even more!

This simple tip saves money on toilet cleaners and air fresheners! A cheap and easy way to keep the toilet clean and smelling fresh is to make your own antibacterial spray. I have a spray bottle on the window sill filled with water and a few drops of tea tree oil. After each flush, we spray two or three squirts in the toilet bowl and close the lid. It keeps the room smelling lovely and our toilet sparkling clean without yucky chemicals.

At 12 years old, my daughter is already helping our family save money on snacks using her Simple Savings skills! With five children in the house, we do a big shop just once a month and are careful to make our food and treats last until the next shop. Recently we were nearing the end of the month and getting low on food. I arrived home one day to find my daughter baking biscuits. 'They're Doos!' she told me. 'You always said if there was nothing in the cupboard, we had to make do, so I made Doos!'

The name has stuck in our house and now whenever we have 'nothing' in the house for lunch boxes, snacks or afternoon tea, she just makes a batch of 'Doos' using whatever she can find in the pantry to 'make do' with. She is proving to be very inventive with her recipes and is turning out to be a real baker. She'll turn out simple but delicious treats such as honey joys, choc chip biscuits, Anzac biscuits, pikelets and pancakes in no time at all! She really has shown that you can make something from almost anything in the pantry and would be wonderful at the $21 Challenge! Here is the recipe for her latest creation, called 'Sort of Scones!'

1 cup oats
1 cup self raising flour
1/2 cup sugar
125g butter
1 egg
1/4 cup milk

Mix all ingredients together, then roll into balls and place on a greased baking tray. Bake in a moderate oven (around 180C) for 10 minutes.

I couldn't be prouder of my daughter's efforts to help us save money and keep everyone well fed. Whenever we think our parenting has a lot to be desired, it's moments like this which prove we have to be doing something right - good things do rub off too!

My husband and I have set a goal to pay off our mortgage within five years. We have a way to go, but keeping this goal in mind has helped us to curb our spending.

I worked out that any amount I put on our mortgage is actually worth five times that amount due to the saving in interest. So when I am thinking about spending $20 on a top, I multiply this amount by five and realise that I do not want to spend $100 on a $20 top! That $20 would be much better invested if it was put into our mortgage.

I am on a very, very low income, so I budget for every bill and expense. I put away bill money every fortnight and that way I have all my bills covered as they arrive, and we seem to just spend the rest. Last year I decided to pay me as a bill, so every pay day I pay me first, just $50. I now have over $1200 in savings. I can't believe how easy it is; just pay yourself before everyone else. The first couple of pays it was an effort not to touch it, but as soon as I saw it mounting up, I got very excited. I tell myself all the time that money is power. While $1200 is not much to some people, to me it's a fortune. Try it - it empowers you.

If you have an old bookcase that you no longer need, or is a little too unsteady to use as a bookcase you can transform it into a super cheap underbed storage container! All you need is to buy some castors from your local hardware store. Just screw the castors onto the back of the bookcase, lay it down on its back and roll it under the bed. We have one of these in our boys' room for all their toys and it really reduces all the visible clutter. It's lovely to walk in and all you see are their beds!

I save over $50 per month on skin care preparations for my children's teenage skin. With four of them, I have spent a fortune over the years on pimple creams, Panoxyl at $12 a tube and the latest Diprovan cream at $52 per month.

Once, we ran out and in exasperation I advised my daughter to use bicarbonate of soda and lemon juice. It works! Cut a lemon in half and save one half covered in the fridge for later use. Rub the other half on affected areas and use as a cleanser. Rinse, then cut a slice off the top, wrap in cling film and place in the fridge. Then mix one teaspoon of bicarbonate of soda with a small amount of water to make a paste. Dab onto affected pimples and leave for half an hour. Then rinse off. (Perfect for evenings when doing homework!)

The lemon acts as an astringent and is antibacterial. The bi-carb dries up the excess oil causing the pimple.

For a cheap and effective moisturiser we use Vaseline Intensive Care at $8.00 a bottle, which lasts six months. A total cost of $26 (lemons from the garden) per year and my daughter has recommended this to all her friends. Much better than $600 spent at the chemist each year!

I have just read the recipe for nut and oatmeal bickies on this site. I have used a similar recipe many times and find that six dozen bickies in one baking session are just too many. So, I only bake one dozen, shape the rest of the batter into balls, lay them in a single layer on a plate or roasting dish and place in the freezer. Once frozen, I put them into plastic sealed bags so they are free-flow and I can cook as many or as few as I need at 18 minutes notice - a couple of extra minutes since they are frozen to start with.
 
This is great for unexpected visitors, kid’s afternoon teas or $21 Challenge weeks. My friends think I'm so clever!

I am saving around $100 a month on my grocery bills, thanks to a few simple changes to our family meals. I wanted to reduce our food bill and after some thought came up with the idea of making two nights per week a '$2 Dinner Night'. For example, one night we will have something like toasted baked bean sandwiches or stuffed baked potatoes; the other I use up all the leftover vegetables in the fridge to make a self-crusting quiche. This reduces the amount of food we waste and the kids love it. Even the simplest meals can be delicious and filling and the savings we are making from our twice-weekly $2 dinners are well worth it!