Saving and planting your own seeds can be addictive - it's fun to participate in the miracle of seeds. When harvesting tomatoes, it's easy to save some seeds for next year. If you've only planted one variety of melon, you can save the seeds you've scooped out before eating. When harvesting lettuce, let a few of the best plants bolt and go to seed, and leave the best beans to dry on the vine for seed. You can develop varieties to match your own needs, that do well in your own particular environment ,or help save an heirloom from extinction. Then, plant your seeds and watch the miracle unfold!
We have books for finding seeds, how to prepare seeds, and growing for seed. At our Ecology Action Research Farm we "save" a lot of rare heirlooms, and we have developed seed strains that have some great qualities.