@gracedentssketty I agree with grow your own as a hobby rather than expecting it to be a major money saver.
We are fortunate to have an allotment so don't need to worry about esthetics when it comes to construction. The polytunnel, fruit cage, bean frames etc are not things of beauty.
If you have gluts of things then learn about preserving them. Unfortunately you are unlikely to be able to trade as everyone has the same gluts at the same time!
Every year when the tomatoes really get going I start making a pasta sauce which I preserve in jars. The recipe changes through the season depending on what is in surplus/mouldering at the bottom of the fridge.
We use that sauce in anything which needs its flavour boosting: bolognese sauce, casserole, stew basically anything savoury. Not sure that it is money saving except that we always have some available so don't need to pop to the shop for a last minute tin of tomatoes.
Blackberry jelly is another preserve I make every year. The ingredients are simply blackberries, granulated sugar and a couple of apples for their pectin. Blackberries can be free or home grown, granulated sugar is cheap, apples can be the bruised ones from the bottom of the fruit bowl.
The kit you need for preserving is a very large pan, jars and lids. There are other things which make the job easier but aren't essential.