Save out a few seeds to plant.
Tomato seeds need a little extra help before storing for the next season. Place them in a container with water. Place it in a warm location for a few days until it starts to get scummy. Pour the contents in a tea strainer and rinse. Let them dry for a few days before storing.
Yup , ... and get some heirloom seeds too.
A friend of mine in New Hampshire grows beans his great-grandfather grew, and keeps at least 1/3 of his harvest in his freezer in case of crop failure.
That's four generations of heritage and survival, and every time he plants, he remembers and honors his great-grandfather.
It doesn't get any better than that: honor and appreciation !