Harvesting your own seeds is a great way to save money and get a lot more for your buck. You can save money by collecting the seeds off your existing plants. You could also ask your friends or family after the summer has passed and everything is dieing off or going to sleep.
Once you have your seeds just store them in a dry safe place till you are ready to plant. You can Google how to store them and the best time to start growing your seeds. You want to plant them at the right time. If you start too early the plant may start to grow out of it's container before it's time to transplant it into the ground.
Another great way to save money is to recycle the containers you usually throw out. I just washed out my roasted turkey container I bought from the grocery store. It has a black bottom and a plastic clear cap. I am going to place some rocks in the bottom and place some soil on top of the rocks. Then I am going to poke holes in the clear lid. This is going to make the perfect container to start growing my flowers and vegetables.
By harvesting my own seeds and planting them in a recycled mini green house I can afford to grow a lot more plants. Gardening does not have to cost a lot of money. Save your seeds and recycle your containers.