I watched a video where a woman set out to prove that canning your own beans is cheaper than buying them already canned. She was careful with her dollars and cents, buying a bag of beans from a dollar store, then showing the price of one can of Great Value brand beans at 58 cents.
I don't know if this is the going price for canned beans. It seemed a little low to me, but I don't ever look at them, so I don't know.
She measured out a half cup of beans to a pint jar 9 times with a few beans left over, then she filled her jars with hot water and canned them. (This is not the USDA recommended way, but many people do it like this.)
All good, right? So she was happy that she wound up with 9 pints of canned beans for a dollar, while it would have cost her $5.22 to buy them. She only spent a half hour of work and the rest was up to the canner. It all sounds very good, and, yes, she did save money. Just not as much as she thought she did.
Let's do the math.
Pinto beans at one dollar plus tax, depending on where you are, anywhere from 0 to 12 cents.
Cost ot rinsing and processing water may be tiny, but it's there.
Cost of pressure cooker can be spread over many times, but it depends on how often and how much you can.
Cost of jars, the same
Cost of lids and rings are around $3,00
Cost of fuel, either electricity or gas, to bring a pressure cooker up to pressure and keep it there 75 minutes, which is how long it takes to can beans. That depends on the fuel and your local rates.
Even at that, she saved money and I do recommend that you try canning beans if you'd like them for recipes or to season quickly for a meal, but remember to think of everything else, too, and not just the cost of the food itself.
Spending pennies adds up, just like saving pennies does.