My family all get together a few times through out the year and "put up food". Last year we canned - peaches, applesauce, apple butter, strawberry jam, strawberry - rubarb jam, corn and something else that is eluding me. Anyway, the point being that including the cost of the lids, sugar, etc.. we saved about .20 - .50 cents a can compared to store bought canned foods. The intitial start up cost was moderate, but it payed for itself in the first year of doing this. The only thing you have to do is watch for low-acid foods. There is a risk of contracting botulism. Follow the canning cook books and there is not a problem.

We also make a trip down the baking eisle at the grocery store EVERY time we go. Last time I was there I found processed white flour (ya ya I know...) for $6 / 25lbs bag. We also look for rice, pastas, rolled oats, sugar, beans, and canned meats that are marked down or on a special. It is a crap shoot, sometimes you find good deals sometimes you end up just getting some exercise.

Long as we make it a family project, the cost is VERY low. Not only that but it is great family time together. It is also a great skill to pass on to younger generations.
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A government big enough to give you everything you want,
is strong enough to take everything you have.
Thomas Jefferson